12 Nov 2019 --- Burger King is strengthening its foothold in the booming market for plant-based foods served in restaurant chains by partnering with Unilever’s The Vegetarian Butcher on the launch of its Rebel Whopper. The fast food giant is rolling out the meat-free version in over 2,500 Burger King restaurants across 25 countries in Europe. Financial terms of the deal have not been disclosed.