From America's Test Kitchen Season 13: Company’s Coming
The perfect prime rib should have a deep-colored, substantial crust encasing a tender, juicy rosy-pink center. To achieve this perfect roast, we started by salting the roast overnight. The salt enhanced the beefy flavor while dissolving some of the proteins, yielding a buttery-tender roast. To further enhance tenderness, we cooked the roast at a very low temperature, which allowed the meat's enzymes to act as natural tenderizers, breaking down its tough connective tissue. A brief stint under the broiler before serving ensured a crisp, flavorful crust.
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Serves 6 to 8
Look for a roast with an untrimmed fat cap (ideally ½ inch thick). We prefer the flavor and texture of prime-grade beef, but choice grade will work as well. To remove the bones from the roast, use a sharp knife and run it down the length of the bones, following the contours as closely as possible until the meat is separated. Monitoring the roast with a meat-probe thermometer is best. If you use an instant-read thermometer, open the oven door as little as possible and remove the roast from the oven while taking its temperature. If the roast has not reached the correct temperature in the time range specified in step 3, heat the oven to 200 degrees, wait for 5 minutes, then shut it off, and continue to cook the roast until it reaches the desired temperature.