3 tbsp golden syrup
175g/6oz icing sugar, sieved
85g/3oz muscovado sugar
300g/10½oz bourbon biscuits, crushed
85g/3oz dark chocolate, minimum 70 per cent cocoa solids
150²µ/5½´Ç³ú dark chocolate, minimum 70 per cent cocoa solids
75²µ/2½´Ç³ú butter, melted
85g/3oz butter
100³¾±ô/3½´Ç³ú double cream
150ml/5½fl oz double cream, plus extra to serve
2 free-range eggs