Combine and stir all sauce ingredients. In a glass baking dish large enough to hold the ribs, completely cover ribs with sauce on both sides, cover and refrigerate a minimum of 12 hours.
Set grill grids at medium position. Preheat grill to low heat. Remove ribs from marinade. Boil the marinade, then brush ribs occasionally with marinade while grilling. Grill slowly for 1 to 1-1/2 hours. Turn often and baste with remaining marinade. Monitor the grill temperature carefully and reduce the heat if ribs cook too fast or scorch. Grill to a minimum of 160°F internal temperature. Slice the rib rack into individual ribs and serve warm with cornbread and vegetables.