Serves 8
For the pastry
plain flour 280g, sifted
fine salt 1 tsp
butter 170g
iced water 6 tbsp
milk 2 tbsp, for brushing
caster sugar 2 tbsp, for sprinkling
For the filling
caster sugar 150g
cornflour 4 tbsp
salt a pinch
blueberries 850g
lemon zest of 1, plus 1 tbsp of juice
unsalted butter 25g, cold