200g/7oz golden caster sugar
250g/9oz sweetened chestnut puree
25g/1oz cocoa powder
30g/1oz icing sugar
1 tsp white wine vinegar
35驳/1录辞锄 dark chocolate, grated (optional)
50驳/1戮辞锄 dark chocolate, grated or flaked (optional)
4 egg whites
400g/14oz whipping cream