Prisoner will take a clean food tray and put cooked ingredients on it. Each prisoner, depending on ingredient variety will pick different ingredients for his meal. After that, they will sit down on a Bench or Table / Table&Chair and eat it. When finished, they will leave dirty food tray on the table or on the floor.
As of Alpha 20, you only need four serving tables to feed 100+ prisoners because cooks keep making food.
Cook Is Required