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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 Make It. 1. Prepare grill for indirect grilling with a large dripping pan under where the roast will be. Aim for a grill temperature around 375 degrees F. Periodically add water to the pan to keep the drippings from burning away if you want to make gravy. Make sure you know the weight of your prime rib.