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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.
Take your room temperature rib roast and make sure all excess fat is trimmed off. Leave a thin layer of fat all around that can stay on the meat, as this helps it to cook properly. Spread approximately 2 tablespoons of butter on the ends of the prime rib and place it fat side up in a non-stick metal pan. Allow the prime rib to cook at 450 degrees for about 15 minutes, and then turn the oven down to 325 for the remainder of the time. Every half hour or so, take the fat that has dropped into the roasting pan and smear it on the ends of the roast with a basting brush.