To make waffles and ribs, you can go to any of your favorite rib joints to pick up a slab, or get fresh ribs from a grocer or butcher to smoke or grill your own. To reheat cold ribs in the oven, simply drench them in more barbecue sauce, cover with foil and cook at 350 degrees F until hot, 10 to 15 minutes. To reheat on a grill, add more barbecue sauce and throw them right on a hot grill until hot and slightly charred.