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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.
Place a meat thermometer into the prime rib and put the meat on the grill, opposite the flame. Continue cooking until the internal temperature of the prime rib reaches 130 degrees F. Every 30 minutes, turn over the prime rib to encourage it to cook evenly.lace a meat thermometer into the prime rib and put the meat on the grill, opposite the flame. Continue cooking until the internal temperature of the prime rib reaches 130 degrees F. Every 30 minutes, turn over the prime rib to encourage it to cook evenly.