Enable ActiveX controls in the Backstage view. 1  Click the File tab. 2  In the Security Warning area, click Enable Content. 3  Under Enable All Content, click Always enable this document's active content. The file becomes a trusted document.
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.
30 minutes before the end of the cooking time remove the prime rib roast from the oven and check the internal temperature. For the roast to be rare the internal temperature should be 120Â°F to 125Â°F but remove from the oven when it is 115Â°F to 120Â°F and allow to stand for 20 minutes. Remove every 30 minutes and turn the roast in the marinade. 2  Remove from the refrigerator and allow the prime rib to set out for approximately two hours before cooking. 3  Allow it to reach room temperature before placing in the oven.