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Burger King is testing out an Impossible Whopper. This is why
(CNN) -- Burger King has a plan to bring in new customers and encourage existing ones to buy more often: Vegetarian Whoppers. The burger chain announced on Monday that it is testing out Impossible Whoppers, made with plant-based patties from Impossible Foods, in 59 locations in and around St. Louis. If all goes well, Burger King will roll out the Impossible Whopper nationally.