2 tbsp. oil
1 lb. hamburger
1 onion, chopped
1/3 c. catsup
1 tsp. mustard
1 tbsp. Worcestershire sauce
1 tsp. salt
Hamburger buns

Put oil in heavy pan. Saute onion; add meat and cook until it loses its red color. Add salt, catsup, Worcestershire sauce and cheese. Cook slowly for 10 minutes. Split buns, spread with mustard and fill with meat mixture. Can be wrapped in aluminum foil and heated on open fire or in oven.