Allow your prime rib time to reach room temperature, about 2 hours or so.
4 pound prime rib
Preheat your grill to 275-300℉. While your grill is preheating, rub all sides on the prime rib with spicy brown mustard.
3 Tablespoons spicy brown mustard
In a small bowl, combine ground coffee, paprika, garlic powder, minced onion, brown sugar, salt and pepper. Mix well.
2 Tablespoons ground coffee, 1.5 Tablespoons paprika, 2 Tablespoons garlic powder, 2 Tablespoons minced onion, 2 Tablespoons brown sugar, 1 Tablespoon salt, 1 Tablespoon pepper
Take your prime rib seasoning and rub all sides of the prime rib. Let your seasoned prime rib sit for about 20 minutes.
Once 20 minutes is up, place the prime rib on the grill and cook for about 2 hours and 45 minutes. Or, until the internal temperature of your prime rib reaches 130℉.
Remove the prime rib from the grill and allow it to rest for about 15 minutes.
Carefully slice your prime rib, serve immediately and enjoy!