INGREDIENTS
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1 1/4 cups all-purpose flour, plus more for dusting
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2 tablespoons sugar
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1/2 teaspoon kosher salt
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1 stick (8 tablespoons) cold unsalted butter, cubed
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6 to 7 tablespoons ice-cold water
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12 ounces rhubarb (about 3 large stalks), sliced 1/2 inch thick
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1 tablespoon unsalted butter
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1/3 cup sugar
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2 cups quartered strawberries
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2 tablespoons cornstarch
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1 large egg (for the egg wash)