1 can tuna in water
1/2 c. mayonnaise
1/2 c. cheese, cubed
1/2 c. celery, chopped
1/4 c. onion, chopped
4 rolls, split

Heat oven to 375 degrees. Mix all ingredients except rolls. Fill rolls with 1/3 cup tuna mixture. Wrap in foil. Bake 20 to 25 minutes until thoroughly heated. Makes 4 sandwiches.