INGREDIENTS
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crust
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2 cups all-purpose flour, plus more for rolling
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3/4 teaspoon kosher salt
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1 1/2 sticks cold unsalted butter, cubed
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1/2 cup ice water
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streusel
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2/3 cup walnuts
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1/2 cup all-purpose flour
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1/2 cup packed light brown sugar
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1/2 teaspoon kosher salt
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6 tablespoons cold unsalted butter, cubed
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filling
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2 Granny Smith apples—halved, cored and thinly sliced lengthwise
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2 firm Bartlett pears—halved, cored and sliced lengthwise 1/4 inch thick
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1/4 cup granulated sugar, plus more for sprinkling
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1/4 teaspoon kosher salt
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2 teaspoons fresh lemon juice
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1 large egg beaten with 1 teaspoon water
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Confectioners’ sugar, for dusting (optional)