This is the new all black burger at Burger King Japan, a sandwich with black buns, black sauce, and black cheese darker than a black hole (seriously, the cheese is extremely black.) It looks kind of gross -- but I really want to try it. How is this black cheese so dark, you ask?
It isn't plastic -- although it looks like it.
It's made smoking it using bamboo charcoal. It probably tastes delicious. The buns are also smoked with bamboo charcoal* and, according to Ashcraft, the sauce is made with onion, garlic, and squid ink (which sounds rather delicious.) The beef patties made also contain black pepper.
* Casey just reminded me of the Dark Vader burger, which also had black buns, but it wasn't as extreme as this one.