Vegetarian patty gets the Burger King Whopper test

(Reuters) - Vegetarian burgers may finally be getting the recognition they need to go main stream. On Monday Burger King and Silicon Valley startup Impossible Foods announced the roll-out of the Impossible Whopper in 59 stores in and around St. Louis, Missouri.To mark the launch on April Fool’s day, the burger giant released a hidden-camera-style promo video showing the serving of plant-based Whoppers instead of meat to customers who marvel that they cannot tell the difference."We wanted to..