200g/7oz fresh blackberries (halved if large)
55g/2oz plain flour
225g/8oz plain flour
1½ tsp bicarbonate of soda
175g/6oz caster sugar
40²µ/1½´Ç³ú demerara sugar
25g/1oz blanched hazelnuts, roughly chopped
pinch salt
1 tsp vanilla extract or paste
40²µ/1½´Ç³ú unsalted butter, melted
75g/2¾oz unsalted butter
100ml/3½fl oz buttermilk or soured cream
3 free-range eggs
100ml/3½fl oz full-fat milk