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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.
The length of time required to cook a prime rib roast depends on the size and doneness. The browning period takes 15 minutes at 450 F followed by slow roasting at 325 F. Total cooking time ranges from 1 1/2 to 4 hours to achieve rare doneness.