The Impossible Whopper is not now available in New Zealand.
Court documents describe Impossible Whoppers cooked on the regular grills as "contaminated" and say vegans who know this is how they're prepared wouldn't buy them.
The suit was launched by Phillip Williams over allegations that the restaurant's cooking methods use the same equipment to cook the vegetarian burger that is used for the meat-based burgers.
Williams alleged that the Burger King where he purchased his meal had no signs indicating that Impossible Whopper patties were cooked on the same grill as meat items on the menu or that asking for a non-broiler cooking method was an option.
Others suggested that it was inconsistent for vegetarians to demand food options and then to sue the chain.
The case is Williams v Burger King Corp, U.S. District Court, Southern District of Florida, No. 19-24755.
Controversy over Burger King's Impossible Burgers cooking methods were first sparked at the beginning of August when the chain's USA head, Chris Finazzo, told Bloomberg the vegan option would be cooked on the same broilers as chicken and beef.
Burger King advertises the plant-based burgers as "100% Whopper, 0% Beef", and notes on its website for the product that the burger is made with mayonnaise - a non-vegan product that contains eggs.
The announcement sparked outrage online, with would-be patrons voicing disgust that their meat-free food would be coming into contact with residuals of meat. This marks the first time that any plant-based meat alternatives have been explicitly sold explicitly to children on this wide of a scale.
Unless you've spent 2019 living under a rock, you're probably aware of how plant-based burgers have been the hottest non-chicken sandwich fast food trend of 2019.
Williams claims that he purchased the Impossible Whopper at a Burger King in Atlanta and is seeking an unspecified amount in damages in addition to requesting that the company stop cooking the meatless burgers on its meat grills, the news outlet said.