1 tbsp. butter
1/4 c. chopped onion
1/4 c. chopped green pepper
1 can (4 oz.) mushrooms, drained or 8 oz. fresh, sliced
2 cans (7 oz.) tuna, drained and flaked
1 med. tomato, chopped
1 tbsp. lemon juice
1/4 tsp. salt
1/8 tsp. pepper
3/4 c. mayonnaise
1 pkg. (8 oz.) noodles, cooked
1/2 c. shredded cheddar cheese

In small skillet, melt butter over medium heat. Saute onion, green pepper and mushrooms, stirring frequently, until tender, about 5 minutes. Stir together with next 6 ingredients. Add noodles, mixing well. Turn into greased 2 quart casserole. Top with cheese. Bake uncovered in 400 degree oven for 20 minutes or until cheese is melted. Serves 6.