420g/15oz pumpkin (or butternut squash), grated
3 oranges, finely grated zest only
1 tsp bicarbonate of soda or 3 tsp baking powder
525g/1lb 3oz soft light brown sugar
900g/2lb icing sugar, sifted
300驳/10陆辞锄 raisins
525g/1lb 3oz self-raising flour
4 tsp mixed ground spices (such as cinnamon, star anise, cardamom and nutmeg)
525ml/18fl oz vegetable oil
450g/1lb butter, softened, plus extra for greasing
9 large free-range eggs, beaten