Several media outlets have reported on that Burger King's Impossible Burger is not entirely vegan because it is cooked on the same grill as the other burgers. (see below)
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Burger King's new meatless Impossible Whopper isn't completely vegetarian or vegan
The chain cooks its Impossible Whoppers — which are "0% beef" — in the same broiler as its beef and chicken offerings.
Burger King Just Made a Controversial Admission That's Going To Upset A Lot Of Customers
There's little worse than exciting your customers, only for them to be disappointed.