Brown bacon, onion, hamburger, and onion; drain fat. Add salt,
mustard, ketchup, vinegar, and sugars to meat and onion mixture.
Drain kidney, wax, and butter beans. Add these beans plus baked
beans to base. Cook in crockpot on low for 4 hours or in 3 qt.
casserole at 300 degrees for 2 to 2 1/2 hours.