Burger King has a dare for its customers. The fast food chain recently launched two plant-based burgers in Sweden, one a meatless version of the classic Whopper and the other a chicken-free version of its chicken sandwich, called the "Rebel Whopper" and "Rebel Chicken King" respectively. The chain is so convinced that its vegetarian versions are indistinguishable from the animal-based versions that it is daring their customers to tell the difference.