Apple Crumble Pie

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Ingredients

1 and 1/2 cups (188g) all-purpose flour (spooned & leveled), plus more for work surface
1 Tablespoon (12g) granulated sugar
1/4 teaspoon salt
1/2 cup (8 Tbsp; 113g) cold unsalted butter, cubed
1/4 cup (60g/ml) ice-cold water, plus more as needed
egg wash: 1 large egg beaten with 1 Tablespoon (15g/ml) milk
1/2 cup (100g) packed light or dark brown sugar
1 teaspoon ground cinnamon
3/4 cup (94g) all-purpose flour (spooned & leveled)
3/4 cup (95g) chopped walnuts
5 Tablespoons (71g) unsalted butter, melted and slightly cooled
10 cups (1.25kg) 1/4-inch-thick apple slices (about 8 large peeled and cored apples)*
1/2 cup (100g) granulated sugar
1/4 cup (31g) all-purpose flour (spooned & leveled)
1 Tablespoon (15g/ml) fresh lemon juice
1 and 1/2 teaspoons ground cinnamon
1/4 teaspoon ground cloves
1/4 teaspoon ground nutmeg
1 teaspoon pure vanilla extract

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