300²µ/10½´Ç³ú plain flour, plus extra for dusting
40²µ/1½´Ç³ú caster sugar
100²µ/3½´Ç³ú caster sugar
2 tbsp cocoa powder
100²µ/3½´Ç³ú icing sugar
7g salt
½ vanilla pod, split and seeds scraped out
280g/10oz walnut pieces
10g/â…“oz fast-action yeast
30g/1oz unsalted butter, melted
60g/2¼oz unsalted butter
15²µ/½´Ç³ú butter, melted
1 large free-range egg, beaten
1 free-range egg white, beaten
1 free-range egg yolk, beaten
150ml/5½fl oz whole milk, warmed
4 tbsp whole milk