Combine garlic, black peppercorns, olive oil, thyme, rosemary, oregano, and salt in a small bowl and mix together.
Rub the prime rib with the garlic mixture and place in a shallow baking dish. Cover and refrigerate overnight.
Preheat oven to 375°F.
Place prime rib in the oven and cook for 1 hour and 10 minutes. Check the internal temperature of the prime rib with an instant-read thermometer. The ideal temperature for medium-rare is 145°F.
Once the desired temperature is reached, remove the prime rib from the oven and let rest for 10 minutes before serving.
Interesting Facts
Prime rib is considered the most tender and delicious cut of beef.
The term "prime rib" refers to the cut of beef, not the grade of beef.