After a successful market test in St. Louis, the fast-food chain plans to bring the vegan Whopper to menus across the U.S.

By Julia Guerra
Photo: Getty Images/RiverNorthPhotography

Burger King is about to do the impossible—burger, that is. Following several months of market testing, the fast-food chain announced that it will start offering its Impossible Whopper nationwide. Starting August 8, the vegan Whopper will be on the menu at Burger King locations across the U.S. (Related: NYC's Momofuku Nishi Serves a Meat-Free "Impossible Burger")

Back in April, the burger chain announced a partnership with Impossible Foods to test a vegan Impossible Whopper in St. Louis, Missouri. While it initially seemed a little suspect that this news was announced on April Fool's Day, Burger King's vegan burger is no joke.

The first people who got to try the Impossible Whopper were subject to a prank that the burger joint played back in March. Traditional Whopper orders were swapped for Impossible Whoppers, unbeknownst to customers. Burger King uploaded a video of the prank to its official YouTube channel, and based on the footage, it seems like even self-proclaimed beef connoisseurs couldn't tell the difference between a regular Whopper and the Impossible Burger.

Since then, Burger King has tested the burger in St. Louis, along with six other markets across the country.

Turns out, the market tests have been going well enough to expand further. Since introducing the burger, "we've heard great feedback and know the Impossible Whopper appeals to both current guests who are already big fans of the Whopper sandwich, as well as new guests who are excited about this new option," Chris Finazzo, president of Burger King North America, said in a statement. In fact, many BK customers have said they find it "really difficult to distinguish between the Impossible Whopper and the original Whopper," Finazzo previously told the Chicago Tribune.

Burger King isn't the only chain trying to appeal to customers who want alternatives to meat. The Impossible Whopper has joined the ranks of other plant-based fast-food orders like White Castle's Impossible Burger sliders, Carl Jr.'s Beyond Burger, and more.

Last year, Impossible Foods introduced a new version of its Impossible Burger at the annual Consumer Electronics Show in Las Vegas. To make the meatless patty feel and taste more like beef, the new recipe is a combination of coconut oil, sunflower oil, potato protein, soy protein, is gluten-free, and has less salt and fat than the original burger, according to CNN.

If you're wondering whether the Impossible Whopper might be a "healthier" alternative to the traditional Whopper, we do know that the vegan version is slated to have the same amount of protein as its beefy counterpart, but with 15 percent less fat and 90 percent less cholesterol, according to The New York Times. Still, the sandwich is "a flame-grilled, plant-based patty topped with freshly sliced tomatoes, fresh lettuce, creamy mayonnaise, ketchup, crunchy pickles, and sliced white onions on a toasted sesame seed bun," according to its official press release. Translation: The burger delivers all the same fixings and flavor as the original, minus the meat. (Related: My Search for the Best Veggie Burger and Meat Alternatives Money Can Buy)

The fact that Burger King will now sell the Impossible Whopper nationwide is a pretty huge deal for vegans veg-curious folks alike. Note that Burger King charges a dollar extra for an Impossible patty over the OG Whopper and that the creamy mayo on the menu is not vegan, so if you're strictly plant-based, just be advised you'll have to order without.