1 (6 oz.) can tuna
1 small onion
1 tsp. lemon juice
1/2 c. chopped celery
1/2 c. mayonnaise
1 c. American cheese, cut in pieces
1 tsp. Worcestershire

Mix ingredients well and put on burger buns. Wrap in foil. Place in a 350°F oven for about 15 minutes or until cheese is melted and burgers are hot.