300驳/10陆辞锄 plain flour
25g/1oz arrowroot, cornflour or cocoa
3 tsp baking powder
250g/9oz caster or brown sugar
50ml/2fl oz sunflower oil
2 tsp vanilla extract
100g/3陆oz unsalted butter
100ml/3陆fl oz double cream
4 medium free-range eggs
80ml/2陆fl oz milk