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1 1/2 cups sugar
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1/4 cup plus 2 tablespoons cornstarch
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1/4 teaspoon salt
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1/2 cup water, cold
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1/2 cup fresh lemon juice
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3 egg yolks, well beaten
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2 tablespoons butter or margarine
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1 1/2 cups boiling water
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grated lemon zest, from 1/2 lemon
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2 drops yellow food coloring, (optional)
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3 egg whites, for meringue
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1/4 teaspoon cream of tartar, for meringue
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1 (9-inch) pie crust
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