1 pound ground beef

½ pound bacon diced

1 medium onion chopped

2 (16 ounce) cans pork and beans drained

1 (15 ounce) can kidney beans drained and rinsed

1 (15 ounce) can butter beans drained and rinsed

¾ cup brown sugar

¾ cup ketchup

2 teaspoons vinegar

1 teaspoon prepared mustard

1 teaspoon salt

In a large skillet over medium-high heat, cook ground beef and bacon; drain well and transfer to the slow cooker.  Add onion, all beans, brown sugar, ketchup, vinegar, mustard, and salt. Mix well, cover, and cook on high for 4 hours or until heated through.  To bake in the oven, preheat the oven to 350°. Cook the beef and bacon as in step 1, then transfer to a casserole dish with a cover. Add remaining ingredients and cover. Bake 45 minutes to an hour.