1. Grate the chocolate in a bowl.
2. Blend the Hazel nuts in your food processor.
3. Add the hazel nuts to the chocolate along with the sugar, coffee, butter.
4. Mix well with a spoon.
5. Prepare a plate with the cocoa.
6. Roll the mix into 1 inch balls with your hands and place them on the cocoa.
7. Once they are all ready roll them gently in the cocoa and then a bit between your hands to remove the excess cocoa.
8. Place them on a serving dish and keep them in the fridge or a cool place until you are ready to serve them.