1. In a bain-marie or stainless steel bowl, set over a pan of simmering water, melt the chocolate. Remove from heat.

2. In a medium bowl, add butter and vanilla. Cream together until light and fluffy.

3. Add chopped chestnuts, mixing well until smooth. Add melted chocolate, mix to combine.

4. Using a teaspoon, scoop out a ball about 2.5 cm in diameter. Shape into ball form, roll into cocoa powder.

5. Set aside and repeat until truffles are finished.