Using your hands, form the boneless rib roast into a cylinder shape. Then, tie the roast with butcher’s twine in order to hold the shape.
Tip* Tying the roast in a cylindrical shape helps for even cooking on the rotisserie.
In a mixing bowl, combine the Private Reserve® Rub and the chopped rosemary. Mix well and set aside.
Place the roast on the rotisserie spit and hold it in place with rotisserie forks. Then, evenly coat the roast with Dijon mustard. Season the Dijon-covered roast with the rub and rosemary mixture, ensuring the ends and entire roast are evenly coated.
Place the roast on the grill, light the rotisserie burner (for gas grill), and turn on the rotisserie motor.
Allow the roast to spin until the internal temperature reaches 100°F. Then, start basting the roast with the butter sauce every seven minutes until the desired internal temperature is 5°F less than the desired temperature.
Remove the roast from the grill, tent with foil, and allow it to rest for 10 minutes.
Remove the roast from the spit, cut and remove the butcher’s twine, slice meat, and serve with roasted garlic mashed potatoes.