What principle dictated the menu structure of traditional *bouchons* regarding ingredients?

Answer

*Rien ne se perd* (nothing is wasted)

The menu in traditional *bouchons* was dictated by the principle of *rien ne se perd*, which meant maximizing the use of all available ingredients, often leading to the utilization of the whole animal.

What principle dictated the menu structure of traditional *bouchons* regarding ingredients?
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