The doughy accompaniment to the beefy delight has been given a make-over as part of a limited edition festive menu by the fast food chain.The Halloween bun was inspired by Japan's popular Black Burger and will taste scarily the same as its Whopper predecessor, but with a BBQ flavour baked into the bread. The fast food chain also launched the Pumpkin Spice Latte as part of the the Burger King Halloween line up that will be available at participating restaurants nationwide until October 31.