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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.
Go to this website for complete directions for low temperature cooking process:http://www.cookingforengineers.com/recip... If you want to cook the prime rib at a higher temperature, start out a 450 degrees F for 15 minutes, then reduce the temperature to 325 degrees F, and roast for 12 to 13 minutes per pound.I would err on the lower amount of time side and roast at 12 minutes per pound or in the case of your prime rib 2.5 to 3.0 hours.irst, take your prime rib out of the refrigerator and bring it to room temperature; a cold prime rib changes the cooking time (longer). If you are using the low (extremely low temperature) method then 200 degree F at 45 minutes per pound, yes, at 200 degrees F (low temperature assures a uniformly cooked prime rib).