1 lb. can kidney beans, drained
2 lb. cans pork & beans
2 c. onions
1 lb. hamburger
1 tsp. salt
1 c. ketchup
2 tbsp. mustard
2 tsp. vinegar
4 (8 oz.) Mozzarella cheese

Mix ingredients together in casserole dish and bake at 400 degrees for 30 minutes.