\documentclass{book}

\usepackage[a5paper]{geometry}
\usepackage[cm]{fullpage}

\usepackage[french]{babel}
\usepackage[nostepnumber]{cuisine2}
\usepackage{graphicx}
\usepackage{makeidx}
\usepackage[utf8]{inputenc}

\usepackage{environ}

\newsavebox\recipebox
\newlength\recipebreaklength
\setlength\recipebreaklength{1.1\textheight}
\NewEnviron{recipe}[3]{%
  \savebox{\recipebox}{\parbox{\linewidth}{%
    \begin{recipe2}{#1}{#2}{#3}
      \BODY
    \end{recipe2}%
  }}%
  \ifdim
      \dimexpr\ht\recipebox+\dp\recipebox\relax 
      > \recipebreaklength
    \begin{recipe2}{#1}{#2}{#2}
      \BODY
    \end{recipe2}%
  \else
    \par\noindent\usebox\recipebox
  \fi
  \bigskip
}

\makeindex

\begin{document}
\input{title.tex}

\tableofcontents

\chapter{Salades}
\newpage
\input{chapters/salades.tex}

\chapter{Soupes}
\newpage
\input{chapters/soupes.tex}

\chapter{Pâtes}
\newpage
\input{chapters/pates.tex}

\chapter{Riz}
\newpage
\input{chapters/riz.tex}

\chapter{Pommes de terre}
\newpage
\input{chapters/patates.tex}

\chapter{Tartes et Quiches}
\newpage
\input{chapters/quiches.tex}

\chapter{Mets exotiques}
\newpage
\input{chapters/exotiques.tex}

\chapter{Poissons et Fruits de Mer}
\newpage
\input{chapters/poissons.tex}

\chapter{Mets divers}
\newpage
\input{chapters/divers.tex}

\chapter{Sauces}
\newpage
\input{chapters/sauces.tex}

\chapter{Boissons}
\newpage
\input{chapters/boissons.tex}

\chapter{Desserts}
\newpage
\input{chapters/desserts.tex}

\printindex

\end{document}