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.
1 If using a cooking bag to cook your prime rib, first sear all sides of the roast in a very hot pan with 2 tablespoons olive oil. 2  Preheat the oven to 325 degrees F, as you will not need the initial higher heat for browning. Check the internal temperature of the meat after 45 minutes instead of 60. 2  If using a cooking bag to cook your prime rib, first sear all sides of the roast in a very hot pan with 2 tablespoons olive oil.