1/2 c. onion
2 tbsp. flour
1 (10 oz.) pkg. frozen peas, cooked and drained
1 tsp. salt
2 tbsp. butter
1 c. milk
1 (6 oz.) can tuna, drained and flaked
2 c. macaroni, cooked and drained
1/2 lb. Velveeta cheese

Saute onion in butter. Blend in flour and gradually add milk. Stir until thick. Add 1/2 pound cheese and stir until melted. Add macaroni, peas, tuna and salt. Mix well. Pour in 2 quart casserole dish and bake at 350 degrees for 40 minutes. After baking, top with slices of Velveeta cheese and stick it back in the oven until the cheese melts.