Black burgers are the new black, in Japan at least. Global food fast food chain Burger King has released a limited edition burger there that's almost entirely black. The Kuro Burger ("kuro" means "black" in Japanese) features a black bun and black cheese, both colored with bamboo charcoal. The burger's black ketchup is dyed with squid ink. The "goth burger," as it has been dubbed, has received mixed reviews from fans.