75驳/2戮辞锄 caster sugar
25g/1oz cocoa powder
400g/14oz self-raising flour, plus extra for rolling
100驳/3陆辞锄 dark chocolate, half roughly chopped, half broken into small pieces
125驳/4陆辞锄 butter, cubed
marmalade or apricot jam and whipped or clotted cream, to serve
150ml/5fl oz milk, plus extra for brushing