Make barbecue sauce! Start by sautéing some onions and garlic (until soft), then add vinegar, ketchup, and sweetener in equal proportions. You can mess with the type of vinegar and sweetener for different tastes. Stir until thoroughly mixed. Cook over low/medium-low heat until all sugar is dissolved and the onions are soft. Whir in a blender or food processor until smooth. Season as desired (salt and pepper, liquid smoke, soy sauce, hot sauce, mustard, booze, whatever). Let bubble until your desired texture and can, or let bubble until a bit past your desired texture, then thin with fruit juice of your choice.