Take a 6-8 pound Prime Rib deboned. (you can request it deboned from the meat department in your local grocery store) Wet the prime rib down with water. (A spray bottle works really well). Pat the above items gently on in order listed.
Heat oven to 450 degrees. Roast on a rack in a shallow pan for 55 minutes. Lower oven temperature to 300 and continue cooking for 2 more hours.
Let sit for about 15 minutes when you take it out of the oven. Then your juices won't all come out at once. It will be more moist.
~Serve with horseradish sauce and enjoy!