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Sear the rib roast (prime rib) for 15 minutes at the higher oven temperature (450 degrees F.), then turn the oven to the lower temperature (325 degrees F.) for the rest of the cooking time. Every 1/2 hour, baste the cut ends of the roast with the fat accumulated in the roasting pan. Do Not Cover the roast.rime Rib Roast (standing rib roast), at room temperature (very important) 2 tablespoons butter, room temperature. Preparation: Preheat oven to 450 degrees F. Pat the room-temperature standing rib roast (prime rib roast) dry with paper towels or napkins.
To successfully cook Prime Rib in the Convection Roast mode, cook the meat at 400 degrees for 15 minutes then reduce the temperature to 350 degrees for the remainder of the cooking time.Cooking times will vary for boneless and bone in roasts but generally allow 1 Â¼ â 1-Â½ hours, plus resting time for a 7-9lb roast.ook at 425 degrees for 15 minutes, reduce the temperature to 350 and cook for another hour. Check the internal temperature of the meat for doneness and remove from the oven. Cover loosely with foil and rest for a minimum of 20 minutes prior to carving. 1  Tweet.