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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.
How To Cook A Prime Rib Roast. If you really want to impress your dinner guests, ask your butcher for USDA Prime. It is the absolute superior grade of beef usually reserved for upscale restaurants. In fact, only 2% of all beef is graded by the USDA as Prime. Preheat your oven to 450 degrees. 2  Use a paper towel to pat the roast dry. 3  Rub butter on the cut ends of the roast. 4  Create a seasoning rub or paste with ingredients such as pepper, coarse salt, garlic powder, and onion powder. 5  Make a series of Â½ inch deep slits all over the top of the roast as well as the sides.