INGREDIENTS
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2 cups all-purpose flour
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1/4 cup sugar
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1/2 tsp kosher salt
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1/2 lb(s) (2 sticks) very cold unsalted butter, 1/2-inch-diced
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1/4 cup ice water
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1/4 cup cornstarch
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4 cups (1/2-inch-thick) sliced fresh rhubarb (1 1/4 pounds)
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6 oz fresh raspberries
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2/3 cup sugar
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1 tsp grated orange zest
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1/4 cup freshly squeezed orange juice
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1 extra-large egg beaten with 1 tablespoon water for egg wash
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Turbinado or demerera sugar, such as Sugar in the Raw