Prep the Prime Rib: Remove the prime rib from the fridge 1-2 hours before cooking to bring it to room temperature. This ensures even cooking.
Season the Prime Rib: Rub the prime rib with olive oil. Then season generously with kosher salt, black pepper, and minced garlic (optional). For added flavor, stuff rosemary and thyme sprigs into the roast or sprinkle them on top.
Prepare the Big Green Egg: Set up the Big Green Egg for indirect cooking by placing the charcoal on one side and leaving the other side empty. Aim for a steady cooking temperature of 225°F. If using wood chips, soak them in water for 30 minutes and add them to the coals to create a smoky flavor.
Place the Prime Rib on the Grill: Place the prime rib on the cool side of the grill, bone side down, and close the lid. Cook the prime rib at 225°F for about 20 minutes per pound. Use a meat thermometer to monitor the internal temperature.
Check for Doneness: For medium-rare, the internal temperature should reach 130-135°F. Adjust the cooking time based on your preferred doneness: Rare: 120-125°F. Medium-Rare: 130-135°F. Medium: 140-145°F. Well-Done: 150°F+
Create the Perfect Crust (Optional): For a crispy exterior, increase the temperature of the Big Green Egg to 500°F in the last 10-15 minutes of cooking. This will help create a caramelized, golden-brown crust.
Rest the Prime Rib: Remove the prime rib from the grill and let it rest for 15-20 minutes. This allows the juices to redistribute, ensuring a tender and juicy roast.
Carve and Serve: Slice the prime rib against the grain into individual portions. Serve with your favorite sides like roasted vegetables, mashed potatoes, or a fresh salad.