Pontefract cake

pontefract cakes, pomfret cakes, pomfrey cakes

Pontefract cakes (also known as pomfret cakes and pomfrey cakes) are a type of small, roughly circular black sweet measuring approximately 3/4" (2 cm) wide and 1/5" (4mm) thick, made of liquorice, originally manufactured in the yorkshire town of pontefract, england.

Source: Wikipedia