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https://github.com/hendricius/the-sourdough-framework
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Thanks Adam Carter!
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@@ -19,7 +19,7 @@
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\node [decision, right of=use_starter, node distance=3cm] (bake_next_week_check) {\footnotesize Baking in next 2 weeks?};
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\node [block, right of=bake_next_week_check, node distance=3.5cm] (store_fridge) {\footnotesize Store starter in fridge at 4°C(40°F)};
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\path [line] (bake_next_week_check) -- node{yes} (store_fridge);
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\node [block, right of=store_fridge, node distance=3cm] (feed_after_fridge) {\footnotesize Feed again using 1:5:5 ration 8-12 hours before making dough};
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\node [block, right of=store_fridge, node distance=3cm] (feed_after_fridge) {\footnotesize Feed again using 1:5:5 ratio 8-12 hours before making dough};
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\path [line] (store_fridge) -- (feed_after_fridge);
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\path [line] (bake_next_day_check) -- node{no} (bake_next_week_check);
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\node [decision, below of=use_starter, node distance=3cm] (freezer_check) {\footnotesize Have a freezer?};
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@@ -129,4 +129,4 @@ degas quickly and turn into very flat breads. I have had great success though wh
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utilizing home milled flour together with a loaf pan or as a pan bread. If you
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have found great ways to work with home milled flour please reach out. The potential
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of using home milled flours is huge. It would enable even distant communities
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to grow their own wheat and be able to produce amazing freshly baked bread.
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to grow their own wheat and be able to produce amazing freshly baked bread.
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@@ -40,18 +40,18 @@ math and then adjust it for the 1.4 kilogram flour quantity.
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\end{figure}
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Note how each of the ingredients is calculated as a percentage
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based on the flour. The 100 percent is the baseline as the absolute
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based on the flour. The 100 percent is the baseline and represents the absolute
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amount of flour that you have at hand. In this case that's 1000 grams
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(1 kilogram).
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Now let's go back to our example and add just the flour, as we have
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Now let's go back to our example and adjust the flour, as we have
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more flour available the next day. As mentioned the next day
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we have 1.4 kilograms at hand (1400 grams).
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\begin{figure}[H]
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\includegraphics{tables/table-recipe-bakers-math.pdf}
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\caption{An example recipe that uses 1400 grams as base and is then
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calculated using baker's math}
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\caption{An example recipe that uses 1400 grams as its baseline and
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is then calculated using baker's math}
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\end{figure}
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For each ingredient we calculate the percentage
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@@ -59,13 +59,14 @@ based on the flour available (1400 grams). So for the water
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we calculate 60 percent based on 1400. Open up your
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calculator and type in 1400 * 0.6 and you have
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the absolute value in grams that you should be using.
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For the second day, that is 840 grams. Proceed and do the same
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thing for all the other ingredients and you know
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For the second day, that is 840 grams. Proceed to do the same
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thing for all the other ingredients and you will know
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your recipe.
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Let's say you would want to use 50 kilograms of flour
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the next day. What would you do? You would simply proceed
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and calculate the percentages one more time. I like this
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to calculate the percentages one more time. I like this
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way of writing recipes a lot. Imagine you wanted to make
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some pasta. You would like to know how much sauce you should
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be making. Now rather than making a recipe just for you, a
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@@ -101,8 +102,8 @@ endophytes living in the grain.
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Simply weigh around 50 grams of flour and add another 50
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grams of water. It doesn't have to be exactly 50 grams of both
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water or flour. You could also be using less and/or simply eyeball
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it. The values are just shown as a reference. Don't use chlorinated
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water or flour. You could also use less and/or simply eyeball it.
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The values are just shown as a reference. Don't use chlorinated
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water to setup your starter. It should be bottled water ideally,
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or here in Germany we can just use our tap water. Chlorine
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is added to water to kill microorganisms. You will not
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@@ -166,13 +167,14 @@ my kitchen.
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\includegraphics[width=\textwidth]{sourdough-starter-microbial-war}
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\caption{A simple visualization of the microbial warfare that happens during the making of a sourdough starter. The
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wild spores on the plant and flour become activated the moment flour and water is mixed.
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Only the most adapt flour fermenting microbes will survive. Because of unwanted microbial fermentation it is advised
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Only the most adapted flour-fermenting microbes will survive. Because of unwanted microbial fermentation it is advised
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to discard the feeding-leftovers of the first days. The surviving yeast and bacteria continuously try to
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outcompete each other for resources. New microbes have a hard time entering the starter and are eliminated.
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}
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\label{fig:sourdough-starter-microbial-war}
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\end{figure}
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Wait for around 24 hours and observe what happens to your starter.
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You might see some early signs of fermentation already. Use your nose
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to smell the dough. Look for bubbles in the dough. Your dough
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@@ -194,15 +196,15 @@ for around 1000 grams of flour (baker's math: 10-20 percent).
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Homogenize your new mixture again with a spoon. Then cover
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the mix again with a glass or a lid. If you notice the top of
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your mixture dries out a lot consider using another cover. The
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dried out parts will be composted by more adapted microbes such as
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mold. In many user reports I saw mold being able to damage
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dried-out parts will be composted by more adapted microbes such as
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mold. In many user reports, I saw mold being able to damage
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the starter when the starter itself dried out a lot. You will
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still have some mixture left from your first day. As this contains
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possibly dangerous pathogens that have been activated we will discard
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this mixture. Once your sourdough starter is mature never
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discard it. It's long fermented flour that is an excellent addon
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discard it. It's long-fermented flour that is an excellent addon
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used to make crackers, pancakes and or delicious hearty sandwich
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breads. I also frequently dry it and use it as a rolling agent
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bread. I also frequently dry it and use it as a rolling agent
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for pizzas that I am making.
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You should hopefully again see some bubbles, the starter increasing
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@@ -245,18 +247,18 @@ The key signs to look at are bubbles that you see in your starter
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jar. This is a sign that the yeast is metabolizing your
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dough and creates CO2. The CO2 is trapped in your dough
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matrix and then visualized on the edges of the container.
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Also note the size increase of your dough. The amount of size
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is irrelevant. Some bakers claim it doubles, triples or quadruples.
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Also note the size increase of your dough. The amount the dough increases
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in size is irrelevant. Some bakers claim it doubles, triples or quadruples.
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The amount of size increase depends on your microbes, but also on
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the flour that you using to make the starter. A wheat flour contains
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more gluten and will thus result in a higher size increase. At
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the flour that you use to make the starter. Wheat flour contains
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more gluten and will thus result in a larger size increase. At
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the same time the microbes are probably not more active compared
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to when living in a rye sourdough. You could only argue that
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to when living in rye sourdough. You could only argue that
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wheat microbes might be better at breaking down gluten compared
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to rye microbes. That's one of the reasons why I decided to change
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the flour of my sourdough starter quite often. I had hoped to create
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an all-round starter that can ferment all sorts different flour.\footnote
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{Whether this is actually working I can't scientifically say.
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an all-around starter that can ferment all sorts of different flour.\footnote
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{Whether this is working I can't scientifically say.
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Typically the microbes that have once taken place are very strong
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and won't allow other microbes to enter. My starter has initially
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been made with rye flour. So chances are that the majority of
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@@ -304,7 +306,7 @@ yeast part of your sourdough and balance the fermentation.
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\includegraphics{figures/fig-starter-maintenance.pdf}
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\caption{A full flowchart showing you how to conduct proper sourdough starter maintenance. You can use a
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piece of your dough as the next starter. You can also use left-over starter and feed it again. Choose an
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option that works fest for your own schedule. The chart assumes that you are using a starter at a 100 percent
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option that works best for your own schedule. The chart assumes that you are using a starter at a 100 percent
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hydration level. Adjust the water content accordingly when you use a stiff starter.}
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\label{fig:sourdough-maintenance-process}
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\end{figure}
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@@ -325,39 +327,38 @@ fermentation period. This piece I would use to regrow my starter again.}
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As explained earlier your starter is adapted
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to fermenting flour. The microbes in your starter are very resilient. They
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block external pathogens and other microbes. That is the reason why, when
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buying a sourdough starter, you will preserve the original microbes. They are
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likely not going to change in your starter. They are outcompeting other
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buying a sourdough starter, you will preserve the original microbes. It is
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likely that they are not going to change in your starter. They are outcompeting other
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microbes when it comes to fermenting flour. Normally everything in nature
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starts to decompose after a while. However the microbes of your starter have
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very strong defense mechanisms. In the end your sourdough starter can be
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starts to decompose after a while. However, the microbes of your starter have
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very strong defense mechanisms. In the end, your sourdough starter can be
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compared to pickled food. Pickled food has been shown to stay good for a very
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long period of time \cite{pickled+foods+expiration}. The acidity of your sourdough starter is quite
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toxic to other microbes. The yeast and bacteria though have adapted to living
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in the high acid environment. Compare this to your stomach, the acidity
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in the high-acid environment. Compare this to your stomach, the acidity
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neutralizes many possible pathogens. As long as your starter has sufficient
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food available it will outcompete other microbes. When the starter runs out of
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food the microbes will start to sporulate. They prepare for a period of no
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food and will then reactivate the moment new food is present. The
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spores are very resilient and can survive under extreme conditions.
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Scientists have claimed they found 250 million year old spores that are still
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Scientists have claimed they found 250 million-year-old spores that are still
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active \cite{old+spores}. While being spores
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they are however more vulnerable to external pathogens such as mold.
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Everything in nature is at some point decomposed and broken down by other
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microorganisms. Under ideal conditions though the spores can survive for a
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Under ideal conditions though the spores can survive for a
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long time.
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But as long as they stay in the environment of your starter they live
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in a very protected protected environment. Other fungi and bacteria have a hard time decomposing your left over starter mass.
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in a very protected environment. Other fungi and bacteria have a hard time decomposing your left over starter mass.
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I have seen only very few cases where the starter actually died. It is almost impossible
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to kill a starter.
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What happens though is that the balance of yeast and
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bacteria changes in your starter. The bacteria is more adapt to living
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in the acidic environment. This is a problem when you make another dough.
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bacteria changes in your starter. The bacteria is more fitted to living
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in an acidic environment. This is a problem when you make another dough.
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You want to have the proper balance of fluffiness and sour notes.
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When a starter has hibernated for a long period
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of time, chances are that you do not have a desirable balance of microbes.
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Furthermore depending on the time your starter hibernated you might only have
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When a starter has hibernated for a long period, chances are that
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you do not have a desirable balance of microbes.
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Furthermore, depending on the time your starter hibernated you might only have
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sporulated microbes left. So a couple of feedings will help to get your
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sourdough starter into the right shape again.
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@@ -379,16 +380,16 @@ flour you feed it takes longer for your starter to be ready again.
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\textbf{I would like to take a break and bake next week:}
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Simply take your leftover starter and place it inside of your fridge. It will stay good
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for a very long period of time. The only thing I see happening is the surface
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drying out in the fridge. So I recommend to drown the starter in a little bit
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of water. This extra layer of water provides a good protection from the top
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part drying out. As mold is aerobic it can not grow efficiently grow under
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for a very long period. The only thing I see happening is the surface
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drying out in the fridge. So I recommend drowning the starter in a little bit
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of water. This extra layer of water provides good protection from the top
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part drying out. As mold is aerobic it can not grow efficiently under
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water \cite{mold+anaerobic}. Before using the starter again simply either stir
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the liquid into the dough or drain it. If you drain the liquid you can use it
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to make a lacto fermented hot sauce for instance.
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The colder it is the longer you preserve a good balance of yeast and
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bacteria. Generally, the warmer it is the faster the fermentation process is,
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bacteria. Generally, the warmer it is the faster the fermentation process is,
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and the colder it is the slower the whole process becomes.
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Below 4°C the starter fermentation almost completely stops. The
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fermentation speed at low temperatures depends on the
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@@ -404,18 +405,19 @@ be good for years.
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Simply take your starter and mix it with flour. Try to crumble the starter as
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much as possible. Add more flour continuously until you notice that there is no
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moisture left. Place the flour starter at a dry place in your house. Let it
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dry even more. If you have a dehydrator you can use this to speed up the
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moisture left. Place the flour starter in a dry place in your house. Let it
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dry out even more. If you have a dehydrator you can use this to speed up the
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process. Set it to around 30°C and dry the starter for 12-20 hours. The next
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day return your starter. It is in a vulnerable state as there is still a bit
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day your starter has dried out a bit. It is in a vulnerable state as there is still a bit
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of humidity left. Add some more flour to speed up the drying process. Repeat
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for another 2 days until you feel that there is no humidity left. This is
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important or else it might start to mold. Once this is done simply store the
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important or else it might start to grow mold. Once this is done simply store the
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starter in an airtight container. Or you can proceed and freeze
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the dried starter. Both options work perfectly fine. Your sporulated starter
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is now waiting for your next feeding.
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is now waiting for your next feeding. If available you can add some silica
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bags to the container to further absorb excess moisture.
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Initially it would take 3 days or so for my starter to become alive again
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Initially, it would take 3 days or so for my starter to become alive again
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after drying and reactivating it. If I do the same thing now my starter is
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sometimes ready after a single feeding. It seems that the microbes adapt. The ones
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that survive this shock become dominant subsequently.
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@@ -424,5 +426,5 @@ So in conclusion the maintenance mode you choose depends on when you want to bak
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The goal of each new feeding is to make sure your starter
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has a desired balance of yeast and bacteria when making a dough. There is no need to provide your
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starter with daily feedings, unless it is not mature yet. In that case, each
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subsequent feeding will help to to make your starter more adapt at fermenting
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subsequent feeding will help to make your starter more adept at fermenting
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flour.
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