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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.
4. Cooking prime rib to a temperature of 135-140 degrees (medium-rare) for maximum flavor and tenderness will give you a tender juicy roast or 140-150 degrees (medium) but no more, anything more will begin to dry out the roast.n method A because a temperature of 250 degrees is used the temperature will only rise about 2-4 degrees during resting time. The second method is a non-risky way to cook a prime rib roast, it will give you a tender, juicy roast that wonât embarrass you. 1.