The McRib is only back through November 14th, but the internet has helpfully come up with a way to ensure you won't miss it much once it's gone: Analyzing the contents of the mysterious sandwich. The reconstituted pork-based patty probably contains tripe, heart, and scalded stomachs. That may sound a bit gross to some, but they're all edible meats already found in products like sausages. Surprisingly, the bun seems more troubling. It contains a tiny amount of azodicarbonamide, which is banned as a food additive in Europe and Australia. The flour-bleaching agent is often used in foamed plastics, like those found in gym mats and shoe soles. On the other hand, when one order a McRib it's for the novelty, not because it's the foundation of a healthy diet.