u/muscle_n_nerve

This is a sentence in Ewha: "그 삭당의 잘하는 음식을 알려 주고, 먹을 음식을 정해 보세요." I understand the gist of this sentence: "Tell / inform about the restaurant's good food and decide on food." A few questions I have: should it be '먹은 음식을' instead of 먹을 음식을? Why say 잘하는 음식 and not 좋은 음식. Thanks!