We use this recipe on ribs or on meatballs- very good and easy to make!
 Barbecue Sauce
1 med. onion, diced
1/4 cup vinegar
2 tablespoons sugar
1 cup ketchup
3 tablespoons worcestershire sauce – check if your is gluten free
1 tablespoon prepared mustard
2 teaspoons salt
Mix all ingredients together.
I usually double this for a slow cooker of meatballs or a few racks of ribs.  We like the extra sauce on rice with the meal.