1 tbsp. butter
1/4 c. finely chopped onion
1/4 c. finely chopped green pepper
1 can (4 oz.) drained mushrooms
2 cans (7 oz.) tuna, drained and flaked
1 med. tomato, peeled and chopped
1 tbsp. lemon juice
1/4 tsp. salt
1/8 tsp. pepper
3/4 c. Hellman's mayonnaise
1 pkg. (8 oz.) noodles, cooked
1/2 c. coarsely shredded Cheddar cheese

In small skillet melt butter, 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 until cheese is melted.