Since 2012 Burger King in Japan has been selling a burger known as the Kuro Burger which means Black Burger. They have taken it to the next level and are now selling the Kuro Burger with a layer of cheese which is black.
The black coloring comes from bamboo charcoal and is in both the bun and the cheese. There is also an onion and garlic sauce made with squid ink, beef patties made with black pepper. There are two types of burgers: the Kuro Pearl and the Kuro Diamond with all the fixings. The burgers go on sale on 19th of September in Japan for a limited time only.