1 (8 oz.) can tomato sauce
1 lb. hamburger
1/2 c. bread crumbs
1/2 tsp. oregano
1/4 tsp. salt
2 c. Mozzarella cheese

Reserve 1/2 cup tomato sauce. Mix remaining sauce, hamburger, bread crumbs, and oregano. Divide into 6 equal portions. Make into patties and fry until done. Spread reserved sauce on patties. Top with cheese. Heat until cheese melts.