Apple Pie with Sourdough Pastry

Name: Apple Pie with Sourdough Pastry
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: American
Ingredients: 1 x Sourdough Shortcrust Pastry; 1kg apples (A mix of tart and sweet. Granny smith, braeburn, gala...); 1 medium lemon, zest and juice; 60g granulated sugar; 2 tablespoon cornflour; 1 1/2 teaspoon ground cinnamon; 1/2 teaspoon ground nutmeg; 1/2 teaspoon salt; 1/4 teaspoon allspice; 1 egg + 1 teaspoon water; granulated sugar for topping