In a large bowl, mix flour and salt. Cut in the chilled butter until the mixture resembles coarse crumbs. Gradually add ice water, one tablespoon at a time, just until the dough comes together.
2 ½ cups all-purpose flour, 1 cup unsalted butter, ½ teaspoon salt, 6-8 tablespoons ice water
Divide the dough in half, shape into discs, wrap in plastic wrap, and chill for at least 30 minutes.
Preheat the oven to 375°F (190°C).
In a large bowl, combine apples, cranberries, sugar, lemon juice, cornstarch, cinnamon, and nutmeg. Toss gently until evenly coated.
4 medium apples, 2 cups cranberries, ¾ cup sugar, 1 tablespoon lemon juice, 2 tablespoons cornstarch, 1 teaspoon ground cinnamon, ¼ teaspoon ground nutmeg
On a floured surface, roll out one dough disc into a 12-inch circle and place it in a 9-inch pie dish. Spoon the fruit mixture into the crust.
Roll out the second disc and cut it into strips to create a lattice pattern over the top. Brush lightly with melted butter and sprinkle with a little sugar.
1 tablespoon unsalted butter
Bake for 40–45 minutes, or until the crust is golden brown and the filling is bubbling.
Let the pie cool for 15–20 minutes before serving warm.