Fry 1 pound hamburger until brown; drain. Add 8 slices bacon (cut up), 1/2 cup ketchup, 1/3 cup white sugar, 1/2 cup brown sugar, 1 teaspoon vinegar, 2 teaspoons mustard, and 1 onion (chopped). Cook together to blend, then add 1 can pork & beans (undrained), 1 can red kidney beans (drained), and 1 can butter beans (undrained). Bake in casserole 1 1/2 hours at 350 degrees.