Remove prime rib from refrigerator at least two hours prior to cooking. Rub exterior with prime rib seasoning; let stand for at least one hour. Place in a 500° oven for 20 minutes; reduce heat to 325° and cook until interior temperature reaches +/- 120°. Remove from oven and allow the prime rib to rest for at least 30 minutes before slicing (internal temperature should reach about 130°). First slice ribs from the roast and then slice roast and serve.
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