Burger King employee Rumi Sekine shows the Kuro Diamond burger, right, and the Kuro Pearl burger at its Shibuya restaurant in Tokyo Tuesday, September 16, 2014. The international hamburger chain in Japan will launch the two new “kuro burger”, or “black burger” menus that sport buns, cheese and sauce all in black color, starting on Friday, Sept. 19, for a limited period. The buns and cheese are darkened with bamboo charcoal while the beef patties made with black-pepper are topped with the garlic sauce using squid ink. (Photo by Koji Sasahara/AP Photo)

Black hamburger buns are seen at a Burger King restaurant on September 18, 2014 in Tokyo, Japan. The black burgers, one a Kuro Pearl at 480 yen ($4,41), has black buns and cheese smoked with bamboo charcoal and black sauce made of squid ink. The other, the Kuro Diamond at 690 yen ($6,35), comes also with lettuce, tomato, onion and mayonnaise. The burgers are available from September 19 through early November in Burger King restaurants throughout Japan. (Photo by Keith Tsuji/Getty Images)

An advertising poster touting the new black hamburger is seen at a Burger King restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

A Burger King employee prepares a black burger at a company restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

Advertising place mats touting the new black hamburger are seen at a Burger King restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

A Burger King employee holds a stack of sliced black cheese at a company restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

A Burger King employee holds two black hamburgers at a company restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

Black hamburgers are seen at a Burger King restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

Two wrapped black hamburgers are seen at a Burger King restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

A black hamburger is seen at a Burger King restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

A Burger King employee prepares a black hamburger at a Burger King restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

A Burger King employee prepares a black burger at a company restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

Black hamburger buns are seen at a Burger King restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

A Burger King employee prepares a black burger at a company restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

A Burger King employee prepares a black burger at a company restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)

In this September 16, 2014 file photo, a man walks by a Burger King poster advertizing the Kuro Diamond burger, top, and the Kuro Pearl burger in front of its Shibuya restaurant in Tokyo. (Photo by Koji Sasahara/AP Photo)

In this September 16, 2014 file photo, Burger King's new menu Kuro Diamond burger is prepared by employee Rumi Sekine at its Shibuya restaurant in Tokyo. (Photo by Koji Sasahara/AP Photo)

Burger King employee Minako Matsumoto displays two black hamburgers at a Burger King Japan's restaurant on September 18, 2014 in Tokyo, Japan. (Photo by Keith Tsuji/Getty Images)