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Combine the rosemary, parsley, garlic, oil, mustard, salt, and pepper in a food processor. Pulse until the herbs are finely chopped and the ingredients are combined.
Coat the entire prime rib with the herb mixture. Refrigerate, uncovered, for 4 hours.
When ready to cook, start the Traeger on Smoke with the lid open until a fire is established (4-5 minutes). Turn temperature to 250 degrees F and preheat, lid closed, for 10 to 15 minutes.
Place the prime rib, bone side down, on the grill.
Grill, allowing 12-15 minutes per pound, until the internal temperature of the thickest part of the prime rib reaches 120-130 degrees F for rare to medium-rare, about 1 hour.
Remove the prime rib from the grill, tent loosely with foil, and let rest for 15 minutes before slicing. Enjoy!
Recipes for grilling and smoking turkey, cooking grilled chicken, steak, bacon, brisket, salmon, vegetables and everything in between. Best smoked recipes for your grill.