Melt the chocolate in the microwave at half power, in burst of 30 seconds at a time.
Add the melted chocolate to the other ingredients and mix well.
Place the truffle mixture in the fridge for about a couple of hours or until it has thickened sufficiently to form into balls.
Grate the remaining chocolate onto a large plate.
Take a teaspoon of the truffle mixture, roll into a ball and coat with grated chocolate. Repeat with the remainder of the mixture and then place in the fridge.