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@@ -1,6 +1,15 @@
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\chapter{Making a sourdough starter}%
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\chapter{Making a sourdough starter}%
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\label{chapter:sourdough-starter}
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\label{chapter:sourdough-starter}
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\begin{quoting}
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\begin{quoting}
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\begin{figure}[!htb]
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\centering
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\includegraphics[width=\textwidth]{sourdough-starter-activity-indicators}
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\caption[Very active sourdough]{A very active sourdough starter shown by the
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bubbles in the dough.}%
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\label{fig:sourdough-starter}
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\end{figure}
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In this chapter you will learn how to make your
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In this chapter you will learn how to make your
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own sourdough starter, but before doing so you will
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own sourdough starter, but before doing so you will
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quickly learn about baker's math. Don't worry,
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quickly learn about baker's math. Don't worry,
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@@ -12,6 +21,8 @@ your starter's readiness, as well as
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how to prepare your starter for long-term storage.
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how to prepare your starter for long-term storage.
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\end{quoting}
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\end{quoting}
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%\iffalse
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\section{Baker's math}%
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\section{Baker's math}%
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\label{section:bakers-math}
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\label{section:bakers-math}
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@@ -80,20 +91,23 @@ hungry family arrives. You are tasked with making pasta
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for \num{20} people. How would you calculate the amount of sauce
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for \num{20} people. How would you calculate the amount of sauce
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you need? You go to the internet and check a recipe and then
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you need? You go to the internet and check a recipe and then
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are completely lost when trying to scale it up.
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are completely lost when trying to scale it up.
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% \fi
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\section{The process of making a starter}
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\section{The process of making a starter}
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\begin{figure}[!htb]
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\centering
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\includegraphics[width=\textwidth]{sourdough-starter-activity-indicators}
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\caption[Very active sourdough]{A very active sourdough starter shown by the
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bubbles in the dough.}%
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\label{fig:sourdough-starter}
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\end{figure}
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Making a sourdough starter is very easy, all you need
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Making a sourdough starter is very easy, all you need
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is a little bit of patience. It is in fact so easy that it can be summarized
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is a little bit of patience. It is in fact so easy that it can be summarized
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in a simple flowchart~\ref{fig:sourdough-starter-process} The flour you should
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in a simple flowchart~\ref{fig:sourdough-starter-process}.
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\begin{flowchart}[!htb]
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\centering
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\input{figures/fig-starter-process.tex}
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\caption[The full sourdough starter process]{The process of making a sourdough
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starter from scratch.}%
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\label{fig:sourdough-starter-process}
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\end{flowchart}
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The flour you should
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use to bootstrap your starter is ideally a whole flour.
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use to bootstrap your starter is ideally a whole flour.
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You could use whole-wheat, whole-rye, whole-spelt or
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You could use whole-wheat, whole-rye, whole-spelt or
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any other flour you have. In fact gluten free flours such
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any other flour you have. In fact gluten free flours such
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@@ -131,14 +145,6 @@ not airtight. You still want some gas exchange to be possible.
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I~like to use a glass and place another
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I~like to use a glass and place another
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inverted one on top.
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inverted one on top.
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\begin{flowchart}[!htb]
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\centering
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\input{figures/fig-starter-process.tex}
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\caption[The full sourdough starter process]{The process of making a sourdough
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starter from scratch.}%
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\label{fig:sourdough-starter-process}
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\end{flowchart}
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Now an epic battle begins. In one study~\cite{yeasts+biocontrol+agent}
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Now an epic battle begins. In one study~\cite{yeasts+biocontrol+agent}
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scientists have identified more than \num{150}~different yeast species living
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scientists have identified more than \num{150}~different yeast species living
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on a single leaf of a plant.
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on a single leaf of a plant.
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@@ -147,6 +153,14 @@ the upper hand in this battle. Other pathogens such as mold
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are also being activated as we added water. Only the strongest
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are also being activated as we added water. Only the strongest
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most adaptable microorganisms will survive.
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most adaptable microorganisms will survive.
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\begin{figure}[!htb]
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\includegraphics[width=\textwidth]{sourdough-starter-microbial-war-i}
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\caption[Microbial warfare during sourdough early days]{A simple
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visualization of the microbial warfare that happens during the early days of making of
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a sourdough starter.}
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\label{fig:sourdough-starter-microbial-war-i}
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\end{figure}
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By adding water to the
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By adding water to the
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flour the starches start to degrade. The seedling tries to
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flour the starches start to degrade. The seedling tries to
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sprout but it no longer can. Essential for this process is the
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sprout but it no longer can. Essential for this process is the
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@@ -188,20 +202,6 @@ days my new starter seems to be quite alive already. This might
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be due to previous contamination of flour fermenting microbes in
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be due to previous contamination of flour fermenting microbes in
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my kitchen.
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my kitchen.
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\begin{figure}[!htb]
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\includegraphics[width=\textwidth]{sourdough-starter-microbial-war}
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\caption[Microbial warfare during sourdough early days]{A simple
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visualization of the microbial warfare that happens during the making of
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a sourdough starter. The wild spores on the plant and flour become
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activated the moment flour and water is mixed. Only the most adapted
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flour-fermenting microbes will survive. Because of unwanted microbial
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fermentation it is advised to discard the feeding-leftovers of the first
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days. The surviving yeast and bacteria continuously try to outcompete
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each other for resources. New microbes have a hard time entering the
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starter and are eliminated.}%
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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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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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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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to smell the dough. Look for bubbles in the dough. Your dough
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@@ -252,6 +252,14 @@ great option if the starter was accidentally depleted. A practical approach
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is to store all discard in a single jar in the fridge, adding new discard on
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is to store all discard in a single jar in the fridge, adding new discard on
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top as needed and using it whenever required.}
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top as needed and using it whenever required.}
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\begin{figure}[!htb]
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\includegraphics[width=\textwidth]{sourdough-starter-microbial-war-ii}
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\caption[Microbial warfare during sourdough later days]{A simple
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visualization of the microbial warfare that happens during the later days of making of
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a sourdough starter.}
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\label{fig:sourdough-starter-microbial-war-ii}
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\end{figure}
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You should hopefully again see some bubbles, the starter increasing
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You should hopefully again see some bubbles, the starter increasing
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in size and/or the starter changing its smell. Some people give
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in size and/or the starter changing its smell. Some people give
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up after the second or third day, because the signs might no longer
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up after the second or third day, because the signs might no longer
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