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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.
Let it cook at 500 degrees for 15 minutes, then reduce the temperature to 325 degrees F. Let the prime rib cook at 325 for 15 minutes per pound of meat. Remove it from the electric oven and cover the prime rib with aluminum foil. Leave it on the counter to rest for 20 minutes before carving.