INGREDIENTS
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For the Rhubarb filling...
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1 cup of diced fresh rhubarb
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1/4 cup granulated sugar
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1 tablespoon fresh lemon juice
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2 tablespoons corn starch, sifted
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For the custard filling...
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1 1/2 tablespoons corn starch, sifted
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1/3 cup granulated sugar
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3/4 cup whole milk
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2 tablespoons butter
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1 large egg yolk, slightly beaten
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1 teaspoon pure vanilla extract
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For the dough...
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2 cups all purpose flour, sifted
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1/2 cup granulated sugar
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1/2 cup (1 stick) butter, cold cut into 1/2 inch dice
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3/4 teaspoon baking powder
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1/8 teaspoon salt
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finely grated zest of 1 lemon
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1/2 cup milk
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Egg wash...
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1 egg beaten with 2 tablespoons of milk