The gyudon (rice covered with beef and vegetables) refers to a cuisine for the common people that consists of a bowl of rice topped with solid pieces of chopped-up pork ribs or pieces of sliced meat simmered with onions in a mixture of sugar and soy sauce.
牛丼（ぎゅうどん）とは、牛肉のバラ肉や切り落とし肉をコマ切れにして、タマネギとともに甘辛くにこんだ具材を丼にもった飯のうえにかけただけの庶民料理。