a `demi chef de partie` is half chef is party. so its not a real sentence so whoever taught you that is mental
A chef de partie is a staition chef in charge of particular area of production.
The plural of chef de partie is chefs de partie.
it is a position above a commis but below a chef de partie
: A chef de partie, also known as a "station chef" or "line cook", is in charge of a particular area of production. In large kitchens, each station chef might have several cooks and/or assistants. In...