A bunch of vegans are suing Burger King because they want to have their Impossible Burgers their way ... pristine, without any meat residue on the grill.

Phillip Williams just filed a class-action lawsuit, claiming the burger giant advertises the Impossible Burger as a vegan alternative to its meat burgers, yet they're all cooked on the same grill.

Williams says his burger was contaminated by meat byproducts. He bought the burger in question in ATL.

The lawsuit says Burger King has no disclosures on its menu that would notify a consumer prior to the purchase of the Impossible Whopper that it was cooked in a manner that would result in meat by-products on the burger.

He notes there have been numerous complaints posted online by outraged vegans.