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Whisk the flour, sugar, and salt together in a medium bowl. Using a pastry cutter or a couple forks, cut in the butter until the mixture resembles coarse, pea-sized crumbs. Add the water and stir until the flour is moistened. Add 1 more Tablespoon of water if the dough seems dry. Gently knead the dough a few times on a lightly floured work surface until it all comes together. Shape the dough into a ball and flatten it into a thick disk. Wrap it in plastic wrap and refrigerate it for at least 1 hour and up to 3 days (or freeze up to 3 months).
Mix the apples, brown sugar, flour, lemon juice, cinnamon, and nutmeg together in a large bowl. Cover tightly and let sit until the dough is ready. I usually cover it and keep in the refrigerator during this time.
Preheat oven to 375°F (190°C). Line a large baking sheet with parchment paper or a silicone baking mat. Set aside.
On a lightly floured work surface, roll the dough into a 12-inch circle (or any shape, really!). Trim the rim of the circle to make a clean cut if desired. Transfer dough to the prepared baking sheet.
Arrange the apples (not the juices) into the center of the dough, leaving a 2-3 inch border all around. Gently fold the edges of the dough over the apples, overlapping the dough as necessary. Press gently to seal the edges. Drizzle 3 Tablespoons of salted caramel over the filling (not the crust). Brush the crust edges with egg wash and sprinkle the whole thing with walnuts, if using.
Bake until the filling is bubbly and the crust is golden brown, about 35-38 minutes. Allow to cool on the baking sheet for 10 minutes before slicing and serving.
Serve with extra salted caramel sauce drizzled on top.