1 can tuna, drained
1/4 c. onion, chopped
1/4 c. pickle relish
1 c. celery, chopped
1/4 c. mayonnaise
1/4 c. ketchup
Cheese slices

Mix together. Put on buns and top with cheese slice. Wrap in foil. Bake at 350 degrees for 15 minutes.