2 tbsp coffee essence
200g/7oz caster sugar
2 tbsp cocoa powder
100²µ/3½´Ç³ú icing sugar, sifted, plus extra for dusting
1 vanilla pod, split lengthways, seeds scraped out using a sharp knife
50g/2oz dark chocolate, finely grated
4 white marshmallows, cut into quarters
10 small ready-made meringue shells, crushed
175ml/6fl oz double cream
6 free-range egg whites
500g/1lb 2oz mascarpone