GÃ¢teau Mont Blanc

Cooking ingredients

300g/10Â½oz caster sugar

250g/9oz sweetened chestnut purÃ©e

1 fresh chestnut, peeled, to garnish

1 vanilla pod, split in half and seeds scraped out using a sharp knife

50g/1Â¾oz plain chocolate

500ml/18fl oz double cream

6 free-range egg whites

}