A bone-in standing rib roast will feed about two people per bone. But if the roast is part of a bigger spread with plenty of other food, you can plan on 1/2 to 3/4 pound of prime rib per person.

A crucial step to cooking the perfect prime rib roast is to let it sit on the counter for at least 4-5 hours before cooking so it reaches room temperature, about an hour per pound. “This assures ...