Tuna Casserole
["1 can tuna", "1/2 onion", "2 c. macaroni", "sliced cheese"]
["Preheat oven to 350\u00b0.", "Boil macaroni; add salt and 1 tablespoon oil.", "Drain macaroni and stir in tuna and onion. Slice cheese and layer on top.", "Bake 20 minutes."]
["tuna", "onion", "macaroni", "cheese"]