A prime rib, also known as standing rib roast, is a cut of beef from the primal rib. While prime rib can be sold bone-in or boneless, a bone-in roast is the best for juiciness.
The entire rib section comprises seven ribs. We cut ours into two sections of 3-bone and 4-bone.
Estimating 1/2 - 3/4 pound servings per person, this 5.5 pound roast will serve 7 - 11 people.