The copper is a typical dessert of Sicily, already known in the period of the Kingdom of the Two Sicilies. It 's a sweet typical of the Feast of the deceased. Inside has a filling of Nutella and covered with crushed.
CURIOSITY: The origin of these cookies is still uncertain. The best hypothesis is that the inhabitants of Catania created the sweet version of a real copper coin, which was conied to replace gold and silver coins when the Kingdom of Sicily was annexed to the Kingdom of Naples.