I tried this recipe for Christmas eve dinner, we bought a 9 1/2lb. boneless prime rib roast and cooked it following the recipe. we cooked it with 1 cup of water and about 1 cup of beef broth for 2 hours with lid on roasting pan and for the first 15 minutes at 450°F then turning the oven to 325°F without opening the oven until the full cooking time was over, letting it rest for 15 minutes before slicing, everyone loved the roast and we had meat that ranged from medium rare to done,everyone was happy and for 10 people there was no roast left. Best recipe ever.