Black bun leaves some freaked out.
Burger King photo
The A.1. Halloween Whopper has A.1. flavor baked into the black bun, which is what accounts for the coloring, the franchise company says. The flame-grilled beef is topped with American cheese, tomatoes, iceberg lettuce, mayonnaise, A.1. sauce, pickles and onions on a black sesame seed bun.
Burger King already has been selling colorful Whoppers in Japan. As part of a summertime promotion, “samurai burgers” with red or black buns were offered. In the U.S., the black Whopper has 710 calories, 43 grams of fat and 1.5 grams of trans fat.
There allegedly are some unsavory residual effects from the new Whooper, which Burger King likely isn't pleased to hear. People have been tweeting that the black bun is turning their feces green.
Read more about that here, if you must: WHOPPER