INGREDIENTS
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5 cups all-purpose flour, divided, plus more for rolling out dough
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2 1/2 teaspoons salt, divided
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1 1 1/4 cup plus 3 tablespoons granulated sugar, divided
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4 sticks (1 pound) unsalted butter, cut into pieces, divided into 2 bowls, and frozen 15 minutes, plus more for baking sheet
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1 large egg
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1 tablespoon whole milk
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3 pounds yellow peaches (6 to 8 medium peaches)
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4 pints blueberries (about 8 cups)
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1/2 cup cornstarch
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2 tablespoons vanilla extract
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3 tablespoons lemon juice
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1 tablespoon sanding sugar or sugar in the raw