“Bap meogeosseo?” (밥 먹었어?) — not really a question about food
It sits in the slot English fills with “how are you”. Which is why a character can burst into tears when a parent asks it over the phone.
food
“Jal meokgetseumnida” (잘 먹겠습니다) — not “bon appétit”
It is a thank-you disguised as a statement about yourself, and it is aimed at whoever is feeding you. Say it to a waiter and it lands wrong.