150驳/5陆辞锄 plain flour, sifted
icing sugar, sifted, for dusting (optional)
125驳/4陆辞锄 pecan nuts, roughly chopped
4 x 2.5cm/1in pieces stem ginger (from a jar), chopped
350g/12oz dark muscovado sugar
250g/9oz plain chocolate, minimum 70 per cent cocoa solids, broken into pieces
250g/9oz butter
5 free-range eggs
1-2 tbsp rum (optional)