\input{./vars}

\begin{document}
\begin{tabular}{|l|l|l|l|}
\hline
\textbf{Oven type}                                                         & \textbf{Plain (no tools)} & \textbf{Inverted tray} & \textbf{Dutch oven} \\ \hline
Gas                                                                        & No                        & No                     & Yes                 \\ \hline
\begin{tabular}[c]{@{}l@{}}Convection\\ (Fan always on)\end{tabular}       & No                        & No                     & Yes                 \\ \hline
\begin{tabular}[c]{@{}l@{}}Convection\\ (Fan can be disabled)\end{tabular} & No                        & Yes                    & Yes                 \\ \hline
Steam                                                                      & Yes                       & Yes                    & Yes                 \\ \hline
\end{tabular}
\end{document}