1 can (7 oz) tuna -- drained

2 tablespoons onion -- chopped

2 tablespoons pickle -- chopped

1/4 cup mayonnaise

slice of cheese -- optional

Combine ingredients. Split and toast hamburger buns, and spread bottom half wit h tuna mixture. Top with a slice of cheese and broil for 4 minutes or until che ese melts. Add bun toppers.