Three hours prior to serving time, set oven at 275, pour one and a half cups of vinegar (white or apple cider) into the side of the pan and place inside the oven to slow bake. The vinegar gives off strong fumes while baking that turn into good ribs smelling odors through out the house.
After one half hour, turn rack over rib side up. Every half hour after this turn the racks over. The last half hour raise the oven to 325.