Impossible Slider

The oldest burger chain in America was, oddly, one of the first to put a plant-based patty on its menu. The Impossible patty is steamed on onions like the original and served with smoked cheddar or jalapeño cheese. Because the slider is all about onion, steam and cheese anyway, the swap is much harder to notice than in a bigger grilled burger.

White Castle added the Impossible Slider in 2018, a year before Burger King’s Impossible Whopper made plant-based burgers a national story. For a chain famous for resisting change, it was a surprisingly early bet.