2 tsp chestnut gel food colouring
120²µ/4½´Ç³ú ground almonds
200g/7oz roasted, skinned hazelnuts
400g/14oz roasted skinned hazelnuts, chopped
340g/12oz icing sugar
320g/11½oz granulated sugar
440g/1lb dark chocolate, finely chopped
100g/3½oz unsalted butter, softened at room temperature
480ml/17fl oz double cream
240g/9oz free-range egg whites (from about 4 medium eggs)