7 oz. box shell pasta
6 1/2 oz. can tuna in water
15 oz. peas
1/2 to 3/4 c. chopped onion to 1 1/2 c. mayonnaise (Hellmann's)
Salt & pepper to taste (about 1/4 to 1/2 tsp. each)

Drain tuna. Drain and rinse peas. Cook pasta and drain. Place in bowl warm - mix in onions, salt, pepper and mayonnaise. Stir well. Stir in peas and tuna, mix well. Refrigerate immediately.