One of the strongest tastes you might ever taste! Unforgettable - if you can't remember them you quite simply weren't there!
They were tiny (very tiny) black squares of strong licorice, with a menthol kick that could lose your taste buds for a few days. These were sold in a tiny silver tin with black writing on and a picture of an Imp. Or latterly in a small black flip-top plastic container. Like tic tacs in a way, but not in taste!
Also, like blackjacks they would turn your tongue black!