This burger has become infamous since Burger King’s fifth anniversary and the Black Burger’s debut.
The Japanese version is made with buns blackened with onion, black pepper, cheese blackened with bamboo charcoal and garlic sauce with squid ink. However, rumors are spreading that the American version will be made with A1 steak sauce. Not much else is yet known about how the buns are blackened, but the ingredients are listed in the image below.
Kanadajin3, a well known Canadian, living in Japan for the past 4 years, made a video in 2014 about the mysterious Black Burger. Apparently, it’s really good!
Source: Crunchyroll