What Is McDonald's Filet-O-Fish Actually Made Of?

When you think of McDonald's Filet-O-Fish, it's that crispy, golden-brown fish patty, melted American cheese, and creamy tartar sauce, all piled onto a soft steamed bun. But what's actually inside this fast food classic? It's not just any fish – McDonald's uses wild-caught Alaskan pollock, a white fish known for its mild taste and firm texture, which happens to be just one of the main ingredients imitation crab is made of.

Beyond just the taste, there's an environmental story behind the Filet-O-Fish. McDonald's sources its pollock from Marine Stewardship Council-certified fisheries, which are all about maintaining healthy marine populations. In 2013, McDonald's became the first major fast-food chain in the U.S. to adopt the MSC blue ecolabel, doubling down on its commitment to responsible sourcing and marine ecosystem health. For a company that's built its name on speed and efficiency, this is a small yet meaningful nod to sustainability.

And then there's the texture. That perfect crispy bite has people trying to replicate McDonald's magic at home, but nailing that exact crunch is no easy feat. A true restaurant-style fish fillet isn't about frying alone — it's about the batter. So, if you're on a mission to recreate that satisfying texture, keep in mind the key to a crisp fish is all in the flour. It's fair to say McDonald's has found a formula that keeps us coming back.

Today's Filet-O-Fish might feel like a standard menu item, but its roots are as humble as they come. In 1962, Lou Groen, a McDonald's franchisee in Ohio, noticed that his sales took a dive every Friday in his mostly Catholic neighborhood. His solution? A fish sandwich to satisfy religious customers who abstained from meat on Fridays. After a trial run, where it faced off against an experimental pineapple sandwich, the Filet-O-Fish earned its permanent spot on the McDonald's menu as its first non-burger item, making waves back in the day.

Since then, the Filet-O-Fish has found its way into menus around the world, picking up some unexpected reinventions along the way. In parts of Asia, it's got a hint of wasabi for some added heat, and in a few U.S. locations, you'll even find it topped with a special Old Bay-infused tartar sauce. Turns out, this fish sandwich knows how to keep things interesting.

And if you're still not quite feeling the Filet-O-Fish, you can always opt for a freshly cooked burger at McDonald's – yes, that's actually possible. But for those who crave a little tradition with their fast food, the Filet-O-Fish remains as classic as it gets, blending history and flavor in each bite — a true original in a world of constant change.