The lawsuit, filed Monday in the Southern District of Florida, claims that although the burger chain advertises its vegan alternative as meat-free, it is contaminated by meat by-product because it is cooked on the same grill as meat products.
The suit accuses Burger King of false advertising and has made money from offering a non-vegan non-vegan alternative.
Burger King declined to comment on multiple media. CNN's sister network HLN has contacted Burger King for answers to the allegations in the lawsuit, but has not yet heard back.
"For guests looking for a meat-free option, a non-slaughter method of preparation is available on request," the website notes.
Phillip Williams, the plaintiff in the case, is a vegan who does not eat or drink anything that uses animal by-products.
He bought an Impossible Whopper at a location in Atlanta in August after seeing commercials and paying a "premium price" for the meat-free option, according to the lawsuit.
The suit alleges that if he had known that the burger would be prepared in such a way, he would not have bought it. [1
Williams "incurred financial damages in the amount he paid to buy" Impossible Whopper, according to the suit.
The lawsuit indicates that several other consumers have made similar complaints online about the chain's practices surrounding the sale of Impossible Whopper.