Sear the rib roast 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. Before searing at high temp you ll need to take the roast out of the oven and let it rest while oven is preheating to 500 f. 135 140 f mauve light pink colored interior. If you buy a roast with the ribs attached have the butcher remove the the backbone or the roast will be difficult to carve. A boneless rib roast may be called eye of the rib roast or if the ribs are still attached a standing rib roast.
Move the rack to the middle position and preheat oven to 200 f. But here s the important part. If you target medium rare you ll. The final prime rib temperature for rare meat is 120 125 f medium rare is 130 135 f and well done is 140 145 f. When ready to roast let the prime rib reach room temperature about 1 2 hours.
Transfer the roast to a wire rack set in a rimmed baking sheet or roasting rack fat side up. 130 135 f pink on the outer crust with a deeper red center. Roast until the internal temperature of meat is 110 f about 3 4 hours. 120 125 f bright red interior. When you cook for a crowd the best rule of thumb is to remove your prime rib roast from the oven when it hits 120 f and allow it to rest for about 20 minutes while loosely tented with foil.
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Well that s when you cook the prime rib at the very low temperature until it reaches 120 f for medium rare and then you roast it at the very high temperature for a short period of time. Sear the rib roast 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.