Few items in fast food generate the devotion the McRib does, and almost none of that devotion survives contact with a plain description of the product. It is a formed pork patty shaped to look like something it is not, and people organise road trips around it.

Both halves of that are worth taking seriously.

What it is actually made of

The patty is mostly pork shoulder, a cheap and flavourful cut, along with other pork trimmings. It is ground, mixed with water and salt and binders, and then pressed into a mould that gives it the ridged outline of a rack of ribs.

That process is called restructuring, and it is completely standard in meat manufacturing. It is how a chicken nugget, a fish finger and most formed patties are made. The only thing unusual about the McRib is that the mould is shaped like a different cut of meat.

There is no bone in a McRib and there never has been. The ridges are decorative. People occasionally report finding bone fragments, which is a manufacturing defect in any ground meat product rather than an intended feature.

Once cooked it is dipped in barbecue sauce and served on a roll with slivered raw onion and dill pickles. The sandwich has historically been listed with around 70 ingredients across the patty, the bun and the sauce, which sounds enormous and is fairly normal once you count every spice and every component of a commercial bun separately.

The bun ingredient people bring up

The one that gets raised is azodicarbonamide, a flour treatment agent used to condition dough, which historically appeared in the McRib bun.

It became famous because the same compound is used in the production of foamed plastics, which produced the yoga mat chemical framing that attached itself to a number of bread products around 2014.

McDonald’s removed azodicarbonamide from its buns as part of a broader ingredient cleanup in the mid 2010s, so the version sold today does not carry it. It is worth knowing the history because the claim still circulates as though it were current, and it is not.

It exists because the McNugget was too successful

This is the part of the story that makes the McRib make sense.

In 1981 Chicken McNuggets were being rolled out and were an immediate hit, big enough that McDonald’s could not secure enough chicken to meet demand. The company needed something else to put in front of customers while the poultry supply chain caught up.

Rene Arend, the company’s first executive chef and the man who had just created the McNugget, was asked to solve it. He developed a pork sandwich, drawing on the barbecue traditions he had encountered in the American South.

So the McRib was never a flagship product. It was a stopgap for a shortage caused by another product’s success, and it has spent forty years as the most beloved stopgap in fast food.

Why it keeps vanishing

Two reasons operate at once, and the second is the bigger one.

The commodity explanation is real but it is often overstated online. It sets the window in which a return is attractive. It does not explain the farewell tours, the countdown campaigns or the deliberate ambiguity about whether this is the last one.

The timeline shows the pattern. It launched in 1981, was pulled in 1985, made scattered regional appearances through the late 1980s, returned nationally in 1994 tied to a Flintstones promotion, ran a farewell tour across 2006 to 2008, and has come back periodically ever since in limited regional and national runs. Each farewell has been followed by a return.

How to find one

Because runs are often regional rather than national, availability differs between neighbouring states and sometimes between stores in the same city.

The McDonald’s app is the reliable check, since a store that is not carrying it will not list it. There are also fan maintained maps that crowdsource sightings during a run, which exist precisely because the chain refuses to publish a simple list, and that absence of information is itself part of the strategy.

Related Questions

More on McDonald’s