the article posted:

Burger King Japan is rolling out another “Kuro Burger” (“Black Burger”), with buns made from bamboo charcoal, an onion and garlic sauce made with squid ink, beef patties made with black pepper, and black cheese, which is also apparently made with bamboo charcoal. There are two types of burgers: the Kuro (Black) Pearl and the Kuro (Black) Diamond with all the fixings. The burgers go on sale later this month in Japan for a limited time only