INGREDIENTS
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3 tablespoons cornstarch
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2 tablespoons all-purpose flour
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1 cup white sugar
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⅛ teaspoon salt
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1 cup water
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Juice of 4 large lemons
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1 tablespoon finely grated lemon zest
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2 tablespoons butter
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4 egg yolks, beaten
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1 (9 inch) pie crust, baked
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4 egg whites
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3 tablespoons sugar
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½ teaspoon vanilla extract
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½ teaspoon cream of tartar