1. In a large skillet, cook bacon over medium heat until crisp. Remove to paper towels to drain. Discard drippings.
2. In the same skillet, cook beef and onion over medium heat until the meat is no longer pink; drain. Combine the beef mixture, bacon, beans, brown sugar, ketchup, vinegar, mustard and salt. Spoon into a greased 2-qt. baking dish.
3. Bake, uncovered, at 325° for 45-60 minutes or until the beans are as thick as desired. Recipe can be easily doubled for a larger group. Yield: 8-10 servings.