Burger King has introduced a meat-free version of its flagship Whopper with a plant-based patty. The Impossible Whopper is designed to imitate the appearance and taste of beef. The plant-based burger is available at 59 locations in the St. Louis area and if the US trial goes well, it will become available at all of its 7,200 locations.

The Impossible Whopper has 15 percent less fat and 90 percent less cholesterol than a standard Whopper, though Burger King chief marketing officer Fernando Machado claims that neither customers nor employees notice the difference. The meat-free burger will be topped with mayonnaise, making it unsuitable for vegans and will cost nearly one dollar more than the beef version.

The plant-based patty is produced by Impossible Foods and is already available at White Castle. The company uses an identical recipe to the other burger chain, which is based on the use of heme, derived from soybean roots.

Impossible Foods developed its burger in hopes of reducing the world’s reliance on animal agriculture. The Impossible Burger attempts to avoid the health issues and ethical concerns related to meat consumption while producing just a fraction of the related greenhouse gases.