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Mix sugar and cornstarch together in the top of a double boiler.
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Add the two cups of water. And combine the egg yolks with the lemon juice and beat until mixed well.
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Add to the rest of the sugar mix.
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Cook over boiling water until thick around 25 minutes.
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Now add the lemon extract, butter and vinegar and stir thoroughly.
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Pour mixture into a deep 9-inch pie shell, and let cool.
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Cover with meringue, and brown in oven.
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MERINGUE:.
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Mix cornstarch and water in a saucepan.
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Add the boiling water and cook stirring until thickened.
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Let sit until cold.
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With electric mixer on high speed, beat the egg whites until foamy.
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Slowly add sugar, and beat until stiff.
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Lower mixer speed then add salt and vanilla extract.
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Gradually beat in cold cornstarch mixture.
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Turn mixer back up to high and beat well. Spread meringue over cooled pie filling. Bake at 350°F for 10 minutes or until top is lightly browned.