Rub generously into all sides of the roast. Place the roast with its fat cap side up on a wire rack inside a roasting pan. Roast the prime rib for 15 to 20 minutes per pound, about 1 ½ to 2 hours for a 5-pound roast. Remove the roast from the oven and place on a cutting board for about 10 minutes to rest before carving and serving.
Ingredients: 1 Preheat oven to 450°F 232°C. . Season boneless rib roast on all sides with salt and pepper. 2 Place on a roasting rack, fat side up; roast for 15 minutes. Reduce heat to 325°F. before resting) or until desired doneness. 3 Transfer roast to cutting board; loosely tent with foil and let stand 15 minutes. Slice roast across the grain.
Approximately 15 minutes for searing the roast at 450 °F prior to roasting and approximately 15 minutes for the roast to rest before serving. The perfect temperature to roast at (after searing) is 325 °F. How long does it take to cook a 5 lb roast at 350 degrees? Cook at 350 degrees F for 20 for 25 minutes per pound.
After cooking your rib roast, allow it to rest at room temperature for about 10 minutes. This lets the juices absorb back into the meat, and the roast will continue to cook a bit during this time. After the resting period, you can begin to carve it. Start by removing twine if you used it. Then, carve the roast into slices up to one-inch thick.