For their 5th Anniversary: A black bun made with bamboo charcoal and squid ink colored black ketchup:
Source – Burger King JP Facebook
They call it the “Kuro Burger” (Kuro means “black” apparently) and it will be available for a limited time across Japan starting at 10:30AM on Friday Sept. 28th.
*slow clap* suddenly white buns and red ketchup seem so mainstream, I’m no longer interested in them. /hipster