"This recipe is outstanding and delicious! Perfectly pink inside and very tender!" -Chris S.
Let the roast come to room temperature, just under 2 hours.
Preheat the grill to 275-300 degrees Fahrenheit. Rub prime rib all over with mustard.
In a bowl, combine the remaining ingredients. Whisk well.
Rub the coffee mixture over the entire prime rib and then let it set for 20 minutes.
Place on the grill and cook for about 2 hours and 45 minutes.
Remove from the grill and allow to rest. Slice, serve and enjoy!