1 can tuna
1 1/2 tsp. mustard
1 1/4 tsp. Worcestershire sauce
1/4 c. salad dressing
1 1/2 tsp. grated onion
2 tbsp. grated pepper
1 tomato, sliced
hamburger buns
sliced cheese

Mix ingredients except for tomato, cheese and buns. Lay buns on cookie sheet. Top with mixture then lay slice of tomato then cover with cheese.

Bake at 300°F until cheese is bubbly and is heated throughout.