140 SAN JUAN — Unilever said today it had expanded its partnership with Burger King to supply its plant-based meat patties for Whopper burgers at restaurants in the Caribbean, Latin America and China. The product, which will be called the “Plant-based Whopper” on menus, is made using patties from Vegetarian Butcher, a company Unilever acquired in 2019. The deal is an expansion of the Dove soap to Hellmann’s mayonnaise maker’s partnership with the fast-food chain that started last year with the launch of the Rebel Whopper burger in Europe, Burger King’s biggest ever product launch in the region. Burger King sells several meat-free versions of its popular Whopper burger, including one from Impossible Meats in the United States.