We've been following the rise of the Impossible Burger from its origins as a promising vegan meat alternative to the darling of chefs like David Chang. It's "bleeding" quality and ability to fill in seamlessly for ground beef has impressed diners and allowed it, and its most direct competitor the Beyond Burger, to thrive in restaurants and grocery stores. Now the Impossible Burger is doing what some might have once thought impossible, but has become less and less improbable: hit the fast food market. White Castle, famous for it's mini-sized, eat-'em-by-the-bagful sliders is putting the Impossible Burger on the menu.

Starting April 12, diners in New York, New Jersey, and the Chicago area can find a vegan slider option at 140 of the burger chain's locations. The burger by itself will retail for $1.99 or can be purchased as part of a combo meal. According to a statement from Impossible Foods, the Impossible Burger is made with "water, wheat protein, potato protein and coconut oil," plus soy leghemoglobin which contains a protein called "heme" that, when cooked, breaks down like meat and releases the burger's signature "bloodlike" juices. As opposed to the thicker, denser Beyond Burgers, the Impossible Burger patty is typically thinner and more akin to a fast food, griddle-style patty. In other words, perfect for White Castle's small, square sliders.