How to Make It
Heat bacon in a Dutch oven over medium heat. Cook 8 minutes. Add onion, thyme, and garlic to pan. Cook 6 minutes. Add 5 cups water and next 6 ingredients (through gochujang); bring to a boil.
Place beans, lentils, and ketchup mixture in a 6-quart slow cooker. Cover and cook on HIGH for 7 hours.
*If you don't have gochujang on hand or want to pass on the slight heat it brings, use tomato paste.