The Kuro Pearl features solely the black buns, black cheese and a beef patty (which isn’t black), while the Kuro Diamond adds on familiar toppings such as lettuce, tomato and onions (also not black). Both variants have black ketchup, too.
The buns, cheese and ketchup are made with squid ink and bamboo charcoal.
The black buns and ketchup aren’t anything new, with Burger King Japan having unveiled them in September 2012, but the addition of black cheese, however, is a novelty.
Source: USA Today/Time/Burger King Japan
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