For the crust: 1½ cups (315g) flour 1 cup (230g) cold butter, cubed 1/3 cup (67g) sugar 1/2 teaspoon salt 1/4-1/3 cup (60-80 ml) ice water For the filing: 1½ pounds (675g) apples, pilled and sliced 3/4 cup (150g) sugar 1/2 teaspoon salt 1 teaspoon cinnamon 1/4 cup (32g) cornstarch 1/4 teaspoon nutmeg 1 tablespoon lemon juice Zest from 1 lemon 1 egg + 1 teaspoon water foe brushing