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In the top of a double boiler, beat the egg yolks, well.
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Combine the flour, sugar, salt and spices and blend into the egg yolks.
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Add the vinegar and mix and then add the warm water.
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Simmer over boiling water for 25 minutes or until the mixture is thickened -- the water should just reach the bottom of the top pan.
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Stir in the butter and cool slightly, about 15-20 minutes, without stirring.
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Pour the warm filling into the baked shell.set aside to cool.
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Preheat the oven to 325°F.
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In a large mixing bowl, beat together the egg whites, salt and vinegar until soft peaks form.
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Gradually add the sugar, 1 tbsp at a time, continue beating until stiff peaks form.
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Sprinkle in the cornstarch just before the beating is completed. The peaks should not topple over when the beater is raised.
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Spread the meringue over the filling all the way to the edge of the pastry.
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Bake for 5-8 minutes, or until the meringue is golden brown.
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Cool the pie completely and then refrigerate.