COOK IT.
Set your Pit Boss grill to 225°F.
Combine the butter with the bacon fat and mix together. Add the Pit Boss Prime Beef Rub, Chophouse Steak Rub, and Boss Rub all together and mix into a paste.
With the roast bone side down, apply the butter and bacon fat pasted to the entire surface of the prime rib - Use gloves, and apply the paste evenly.
Place the roast in the grill, on top of a sheet pan to catch the excess drippings, or you can cook without the pan.
Cook at 225°F for approximately 35 minutes per pound, or when the internal temperature reaches 125°F. At 125°F, remove the roast to rest for 30 minutes.
Increase the temperature on your Pit Boss grill to 350°F and open the sear plate.
Return the roast to the grill and sear to desired crust and temperature - Approximately 10 minutes for Rare to Medium Rare. Use probe thermometer to verify your finished temperature.
Remove and rest for 15 minutes before slicing.