1. Prep the oven to heat to 450F, and liberally season the prime rib roast with pepper and salt. Then, sit it for two hours on the counter or overnight in the fridge.
2. After sitting the prime rib, transfer it into the roasting pan and slide it into the oven (if the roast sat in the fridge, let it lose chill on the counter 30 minutes before cooking time). Cook the roast at 16 to 18 minutes per pound.
3. Check the roast around 30 minutes before the end of the calculated cooking time, and take it down if you note an internal temperature of 120F. Then, sit it tented in foil for 15 to 20 minutes to reach final doneness of 130F to 135F by carryover cooking.

You can also watch this video recipe for more assistance.