Burger King is rolling out the Impossible Whopper nationwide, after a successful trial run testing the meatless burger in St. Louis. The chain announced in a statement today that it plans to test in more markets before distributing the burger nationally by the end of this year.

The Impossible Whopper is made with startup Impossible Foods’ plant-based patties, which are designed to look and taste like meat. The patties are also designed to “bleed,” just like the real thing, which can be attributed to the use of heme, a soy-based compound found in plants and meat. The burgers have 15 percent less fat and 90 percent less cholesterol than regular Whoppers, and Burger King’s taste test experiments claim that customers and employees can’t tell the difference.

Meatless options are gaining popularity at more fast food restaurants. White Castle offers Impossible Burgers, which uses another meat-free patty recipe from Impossible Foods, and Carl’s Jr. sells a veggie burger made by Beyond Meat, a competitor to Impossible Foods.