But why you would want to is another matter entirely.
Just when you thought everything that could be done with burgers had been done, Burger King Japan make these black ones.
As the press release says , the "Kuro" (meaning "black") burgers really are on sale in Japan and come in two varieties: diamond and pearl.
The black colour of the bun is achieved by using bamboo charcoal and squid ink is used for the black sauce. The burgers made their first appearance in 2012 (we deemed it one of the year's greatest fast food inventions) but have been brought back because people actually liked them.
The pearl could be yours for 480 yen (about £2.76). The press release, very roughly translated by Google, says it was "baked in juicy straight fire".
The diamond is a bit pricier at 690 yen (nearly £4). The press release, again badly translated says: "Vegetables is also a luxury item that can be firmly taken".
You'd better be quick though: they will only be available on a limited basis.
