Made this for Christmas Eve, and it turned out perfectly with our 8 pound prime rib. My butcher had said "500 and five minutes a pound". Most of the recipes I found online were not like this, but several were. I tried to keep it stupidly simple. This is a great recipe for us, and got rave reviews from the family. I am not a cook ...if I can do this, so can anyone. The prime rib we had from this recipe got rave reviews from the entire family, so it's keeper for us. Note that we have an electric oven, and used a $14 Taylor digital meat thermometer from Sears.