Appleberry pie

INGREDIENTS

• 500 g plain flour, plus extra for dusting
• 100 g icing sugar
• 1 pinch sea salt
• 250 g unsalted butter, chilled and cut into cubes
• 2 large free-range eggs
• 1 splash milk
• 10 Granny Smith apples, peeled, cored and halved, 3 sliced
• juice and zest of 2 oranges
• 7 heaped tablespoons caster sugar
• 400 g huckleberries or blueberries
• 1 heaped tablespoon plain flour
• 1 large free-range egg, beaten
• 1 small handful demerara sugar
• good-quality vanilla ice cream, optional, to serve
• cream, optional, to serve
• custard, optional, to serve