Tuna Casserole
["1/4 c. onion, finely chopped", "1 Tbsp. margarine", "1/4 c. green pepper, finely chopped", "2 small cans mushrooms, sliced", "2 small cans tuna, drained", "1 tomato, chopped, peeled and drained", "1 Tbsp. lemon juice", "1/4 tsp. salt", "1/8 tsp. pepper", "3/4 c. mayonnaise", "1 (10 oz.) pkg. noodles, cooked", "1/2 c. Cheddar cheese, shredded"]
["In a small skillet, melt margarine and saute onion, green pepper and mushrooms, stirring often, until tender (about 5 minutes).", "Stir together with next 6 items.", "Add noodles, mixing well.", "Turn into a greased 2-quart casserole.", "Top with cheese and bake, uncovered, at 400\u00b0 for 20 minutes."]
["onion", "margarine", "green pepper", "mushrooms", "tuna", "tomato", "lemon juice", "salt", "pepper", "mayonnaise", "noodles", "Cheddar cheese"]