If you want, you may use a paring knife to poke garlic cloves into the roast.
After preparing the pan, roast the prime rib in the oven for fifteen minutes.
Turn the oven down to 325 degrees Fahrenheit (160 degrees Celsius) and roast the prime rib until it’s done to your liking. Use a meat thermometer to check the roast’s interior temperature. The recommended internal temperatures for medium-rare, medium, and well-done meat are 135–57°C, 140–60°C, and 150–66°C, respectively.
Take the roast out of the oven and let it aside to rest for at least fifteen to twenty minutes before carving it.