Edible Dark Mark

Edible Dark Marks are a candy that was created by Fred and George Weasley. Shaped like the Dark Mark used by Lord Voldemort, they were sold at Weasleys' Wizard Wheezes, in a bin with the label "They'll Make Anyone Sick!"

George caught a little boy trying to nick some of these candies and warned him that shoplifters would "pay in more than Galleons."