1 (6 1/2 oz.) can tuna, drained
1 c. chopped celery
1/2 c. diced American cheese
1 tbsp. instant minced onion
1/4 tsp. salt
1/8 tsp. pepper
1/4 c. mayonnaise or salad dressing
6 hamburger buns, split & buttered

Heat oven to 350 degrees. Mix all ingredients except buns. Fill buns with tuna mixture. Place each sandwich on a square of aluminum foil. Fold foil over sandwich and seal securely. Place on baking sheet. Bake for 20 minutes or until heated through or put on a plate and microwave for 2 minutes.