beef · Primal
Beef Rib
The one section a grader looks at to decide what the whole animal is worth.
The rib spans ribs six through twelve. The long muscle running along the spine here braces the back rather than moving the animal, so it stays fine-grained and lays fat down between the fibers instead of building connective tissue. It is also where a carcass is graded — cut open between the twelfth and thirteenth rib and read for marbling.
On the animal
Every other region is a link to that primal. The full butcher chart puts beef, pork and lamb side by side.
Marbling is not spread evenly across an animal, and this is where it concentrates. That is not a coincidence of the grading system — it is the reason the grading system looks here. A USDA grader sees one thing: the face of the muscle exposed when a carcass is cut between the twelfth and thirteenth rib. Prime, Choice and Select are assigned off that single cross-section and then applied to the whole animal.
The two ends are not the same steak
This section is seven ribs long, and it changes as you move along it. At the shoulder end, the cap muscle wrapping the outside is thick and more seams of fat run through the middle. At the loin end, the central eye is larger and rounder and the cap has thinned to almost nothing. Both ends are sold under the same name at the same price per pound. The cap is the better-eating muscle of the two, so if the counter lets you choose, take the end that has more of it.
What the bone does, and does not, do
It does not add flavor. The compounds in bone do not migrate into muscle over a couple of hours of dry heat, and people cannot pick bone-in from boneless off the same animal in a blind tasting. What the bone actually does is insulate one face of the steak, so the meat against it runs cooler and finishes rarer, and it holds the muscle in shape through a long roast.
It also weighs something. On a long-bone steak with the bone scraped clean for presentation, you are buying a substantial piece of skeleton at the same price per pound as the meat. That can still be worth it for what it looks like on the table — just know what the trade is.
Cook it warmer than you think
Fat this heavy has to get hot enough to soften. Pulled at true rare, this meat eats waxy, because the fat between the fibers has not rendered. It is one of the few cuts where medium-rare is not a compromise between two camps but the actual target.
How it eats
Rich enough that portion size matters more here than anywhere else on the animal. Fat renders around the fibers as it cooks, so this meat forgives a slightly late pull far better than a lean cut does — and punishes an early one, because unrendered fat eats waxy.
Typical methods
Cuts
Cuts from this primal
Questions
Common questions
Does a bone-in steak taste better?
No. The bone contributes nothing to the flavor of the meat beside it. It does change how the steak cooks: the side against the bone runs cooler, so a thick bone-in steak finishes less evenly than a boneless one of the same weight. Buy it for the look and the handle, not the flavor.
What is the cap, and why do people talk about it?
It is the muscle wrapped around the outside of the central eye, separated from it by a line of fat. It has a looser grain and heavier marbling than the eye, and most people who eat them side by side prefer it. It is thickest at the shoulder end of the section and nearly gone by the last rib.
Is prime rib always USDA Prime?
No, and the two words are unrelated. The dish is named for the primal, not the grade, and the name is older than the USDA grading system. A roast sold as prime rib may be Choice or Select. If the grade matters to you, look for the shield, not the menu.
More to explore
Other beef primals
Beef Offal
Priced by squeamishness, not by how it eats.
Beef Ground
80/20 isn't a preference. It's most of the recipe.
Beef Shank
More connective tissue than anywhere else on the animal. That is the point.
Beef Round
The cheapest beef in the case, and the least forgiving.
Beef Plate
The only muscles on the animal that never get a day off.
Beef Loin
One primal, most of the steak menu.
Beef Flank
The one steak that shows you, from across the room, which way to cut it.
Beef Chuck
The hardest-working primal on the animal, hiding two of its most tender muscles.
Beef Brisket
Holding the animal up is a full-time job. This is the muscle that does it.