Mix the grated chocolate with the cocoa and hazelnuts. Add the softened butter and mix thoroughly for a few minutes.
While mixing, slowly add the rum. It is advisable to keep tasting – some want more and some want less rum.
Chill the rum mixture for about an hour.
After chilling, cut small portions with a teaspoon and roll into balls with your hands.
Roll the rum balls in chocolate sprinkles, sugar sprinkles, coconut, brittle, sugar, cocoa, according to taste and place in paper cups.