1 c. chopped ham
1/4 c. butter
1/2 c. minced onion
1/4 c. flour
2 c. milk
1 1/2 c. lima beans
1 tsp. Worcestershire sauce
1 tsp. prepared mustard
1/2 tsp. salt
1/4 tsp. black pepper

Cook onion in butter until tender, do not brown. Blend in flour. Add milk. Cook over low heat until sauce is smooth and thick. Add remaining ingredients; heat thoroughly. Serve on toasted buns.