Heat the oven to 225°F.
Use a sharp knife to cut the membrane off the bottom of the ribs. Grab a corner of the membrane and slide your knife between the membrane and the meat. Then slowly cut away the sinews until you can remove the whole membrane.
Place the ribs onto a baking sheet. Dab the meat dry with a paper towel. Sprinkle the barbecue spice all over the meat and rub it in.
Cover the entire tray with foil and close completely. Then place the tray in the center of the oven to bake for 3 hours. Be sure to inspect it occasionally.