200g/7oz golden caster sugar
250g/9oz sweetened chestnut puree
25g/1oz cocoa powder
30g/1oz icing sugar
1 tsp white wine vinegar
35²µ/1ΒΌ΄Η³ϊ dark chocolate, grated (optional)
50²µ/1ΒΎ΄Η³ϊ dark chocolate, grated or flaked (optional)
4 egg whites
400g/14oz whipping cream