Spread approximately 2 tablespoons of butter on the ends of the prime rib and place it fat side up in a non-stick metal pan. Allow the prime rib to cook at 450 degrees for about 15 minutes, and then turn the oven down to 325 for the remainder of the time.pread approximately 2 tablespoons of butter on the ends of the prime rib and place it fat side up in a non-stick metal pan. Allow the prime rib to cook at 450 degrees for about 15 minutes, and then turn the oven down to 325 for the remainder of the time.
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