1 Place the roast (ribs down or fat side up) in roasting pan. 2  Sear the rib roast for 15 minutes at 450Â°F, then turn the oven to 325Â°F for the rest of the cooking time. 3  Every 1/2 hour, baste the cut ends of the roast with the fat accumulated in the roasting pan. Smear the cut ends of the roast with the butter. 2  Place the roast (ribs down or fat side up) in roasting pan. 3  Sear the rib roast for 15 minutes at 450Â°F, then turn the oven to 325Â°F for the rest of the cooking time. 4  Every 1/2 hour, baste the cut ends of the roast with the fat accumulated in the roasting pan.
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