Preheat your pellet grill to 225°F with hickory wood pellets added
In a small pan over low heat, melt the butter and add minced garlic. Cook for 1-2 minutes until fragrant but not browned. Remove from heat
In a small bowl, combine the minced thyme, rosemary, kosher salt, and black pepper
Generously rub the prime rib with the garlic butter mixture, then season with the herb mixture, patting it down into curves and pockets
Place the seasoned prime rib on the grill and smoke for around 5-6 hours or until the internal temperature reaches 130°F for medium-rare
While the prime rib is smoking, occasionally add beef broth to a small aluminum pan on the grill. This will keep the meat moist and add some extra flavor
Once the prime rib is finished smoking, remove it from the grill and wrap it loosely or tent it with aluminum foil while it rests for 20-30 minutes.
After the resting period, unwrap the prime rib from the foil and carve it against the grain into 1/2-inch to 1-inch slices
Serve hot with your favorite sides