《礼记·曲礼上》
主人请客人和他一道祭食。祭饭食的方法是，主人先摆上哪一种就先祭哪一种。
主人延客祭：祭食，祭所先进。殽之序，遍祭之。
The host invites the guest to worship the food with him. The way to worship the rice food is to first worship the one that the host serves first.