180²µ/6¼´Ç³ú plain flour
220g/8oz light brown sugar
150²µ/5½´Ç³ú caster sugar
3 tbsp cocoa powder
¼ tsp salt
pinch of sea salt
150²µ/5½´Ç³ú granulated sugar
1 tsp vanilla extract
300²µ/10½´Ç³ú dark chocolate, minimum 65-75% cocoa solids
100g/3½oz good-quality white chocolate
10g/¼oz salted butter, softened
150²µ/5½´Ç³ú unsalted butter
125ml/4fl oz double cream
4 free-range eggs