Minimal example of Plain TeX recipe, with rules that are too large.

minimal.tex

\def\reciperule{
  \vskip0.5em\hrule\vskip0.5em
}
\def\beginrecipe{
  \par
  \begingroup
  \leftskip=\baselineskip
  \multiply\leftskip by 2
  \rightskip=\leftskip
  \parindent=-\baselineskip
  \parfillskip=0pt plus 1fil
  \reciperule
}
\def\endrecipe{
  \par
  \reciperule
  \endgroup
}

\parindent=\baselineskip

Lorem ipsum dolor sit amet, est no molestiae abhorreant. Pro ei
scripta labores percipit, per te alterum reformidans. Ut dicta exerci
usu, ei principes euripidiqs vis. Vis ad vitae postea alienum.

\beginrecipe
{\bf Blonde roux}

2 tbsp of butter.

2 tbsp of flour.

Melt the butter in a pan and add the flour.

Cook the flour without browning for 2 minutes, stirring with a whisk.
\endrecipe

\noindent
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concludaturque. Ea mea alii illud insolens, sea nobis qualisque
scribentur id, at his alii justo munere. Et meis mollis sit, wisi
laudem legimus nec te.

\end