Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
1         can           tuna -- (7oz) drained, flaked
2         tablespoons   finely chopped celery
2         tablespoons   mayonnaise
1         tablespoon    finely chopped onion
4                       hamburger buns -- split
8                       american singles pasteurized process cheese food slices
                        tomato slices

Preparation:

Combine tuna, celery, mayonnaise and onion; mix lightly. For each sandwich, cover bottom half of bun with cheese food, tuna mixture, tomato slice, cheese food and top half of bun. Wrap each sandwich in heavy aluminum foil. Place sandwich, top side down, on grill; grill over low coals 10 minutes. Turn; grill 10 minutes longer.