2 tbsp. oil
1 lb. ground beef
1 lg. onion
1 (1 lb.) can pork & beans
2 (1 lb.) cans kidney beans
1 c. ketchup
1/2 c. cold water
2 tbsp. mustard
2 tsp. cider vinegar

Brown meat and onions in oil. Mix with remaining ingredients. Bake at 400 degrees for 30-40 minutes.