Place the chocolate, cream and butter in a large bowl over pan of simmering water and allow to melt. Stir well and cool before putting in the fridge to set.
Divide into 20 using a teaspoon or melon baller and roll into balls with lightly oiled hands. Roll in the chopped Walnuts to serve.
Notes
Cooks tipGreat as Christmas gifts in bags tied with ribbon. Try adding 1 tbsp brandy to the mix for extras richness.