INGREDIENTS
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2 refrigerated store-bought pie crusts
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4 c. chopped rhubarb
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2 c. chopped strawberries
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3/4 c. granulated sugar, plus more for sprinkling
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1/4 c. cornstarch
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1 tbsp. lemon juice plus 1 tsp. zest
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pinch of kosher salt
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2 tbsp. cold, unsalted butter, chopped
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1 large egg, beaten
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Vanilla ice cream, for serving