Tuna Casserole
["1 can tuna", "3 c. cooked noodles", "1 small onion", "1 c. cream of mushroom soup, diluted"]
["Cook noodles.", "Alternate layers of tuna, noodles or cream of mushroom soup.", "Bake at 350\u00b0 for 20 minutes."]
["tuna", "noodles", "onion", "cream of mushroom soup"]