Put the ribs, meaty side up, directly on the cooking grate. Cook for two and half hours. Flip the ribs and cook for 30 minutes. Lay out a big double layered sheet of heavy duty foil and place the ribs on it, meaty side up. Wrap up the ribs, sealing package tightly. Return ribs to the grill for one hour. Transfer the packet of ribs to a platter. Raise the temperature of the grill to 400°. Remove the ribs from the foil and return to the cooking grate. Brush with the sauce. Cook for 15 minutes, flip ribs, and brush again. Repeat once more. Remove the ribs to a platter and serve with additional barbecue sauce on the side. Serves four.