1 can (16 ounces) kidney beans, rinsed and drained
1 can (16 ounces) butter beans, rinsed and drained
1/2 cup packed brown sugar
1/2 cup ketchup
4 bacon strips, cooked and crumbled
1 tablespoon cider vinegar
1 teaspoon prepared mustard
1 teaspoon salt
Preheat oven to 325°. In a large skillet, cook beef and onion over medium heat until beef is no longer pink, 5-7 minutes, breaking up beef into crumbles; drain. Stir in remaining ingredients. Transfer to a greased 2-qt. cast-iron pan or baking dish.
Bake, uncovered, until the beans are as thick as desired, 45-60 minutes.