1 sm. can tuna
1/4 c. finely chopped onion
1/4 c. finely chopped celery
1/4 c. mayonnaise

Mix above ingredients.

4 slices tomato
Cheese
4 hamburger buns

Spread tuna mix on each bun. Cover with a slice of tomato and cheese. Bake at 350 degrees for 15 minutes. (Microwave 2 minutes 30 seconds on level 80.) Serves 4.