I'm searching for the term used to describe the inedible part of food which is discarded at the table. Examples are olive pits, mussel shells, edamame pods, etc. Often it is something that you spit out and put back on the plate, like a pit, and often times a restaurant will give you a separate plate for them, like for artichoke leaves. The word "discard" actually has a noun form, which is very close to what I'm looking for, but not quite. The word I'm looking for is an exclusively culinary term. Can anyone help me out here? It's driving me crazy.