150²µ/5Β½΄Η³ϊ plain flour
2 tsp baking powder
175g/6oz caster sugar
25g/1oz cocoa powder
25g/1oz cornflour
250g/9oz desiccated coconut
300²µ/10Β½΄Η³ϊ icing sugar
pinch salt
2 tsp vanilla extract or paste
175g/6oz dark chocolate, minimum 64% cocoa solids, chopped
175g/6oz unsalted butter, softened, plus extra for greasing
40g/1Β½oz unsalted butter
3 free-range eggs, lightly beaten
200ml/7fl oz milk
2 tbsp milk or soured cream