Some Impossible Burgers touch beef Whoppers, but Burger King doesn't call them vegan

Foto: AP Photo/Shizuo Kambayashi Foto: Shizuo Kambayashi/AP

Is a vegan burger that touches beef fat still a vegan burger?

That's the question fast-food chains are grappling with as they increasingly add plant-based options to their menus - but not necessarily the expanded infrastructure to cook the patties separately...

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