1 (6 1/2 oz.) can tuna
1 c. chopped celery
1/2 c. cubed American cheese
1 sm. onion, minced
1/4 c. mayonnaise
6 split hamburger buns

Mix all ingredients except buns together. Butter rolls or use your favorite bread and spread with tuna mixture. Wrap sandwiches with aluminum foil and place on cookie sheet. Bake at 350 degrees for 15 minutes. This is a good cheesy hot sandwich.