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In the top of a double boiler, combing the first three ingredients and mix well.
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Gradually add the milk and stir until well blended.
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Bring the water in the bottom of your double boiler to a rolling boil, then reduce the heat to low and cook the sugar/flour/milk mixture until it thickens;stirring constantly so that it does not stick or burn.
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In a separate bowl, beat the egg yolks until thick and light yellow.
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Taking about 1/2 cup of the hot flour/sugar/milk mixture, "temper" it by adding some of it to the beaten egg yolks; stir well.
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Add the egg mixture back in to the sugar/flour/milk mixture and continue to cook over low heat, stirring constantly, until mixture becomes desired thickness.
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Remove this from the heat and add the first 1 1/2 teaspoons of vanilla flavoring.
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In an ungreased 3 quart baking dish, layer 1/4 of the vanilla wafers.
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Peel and slice one banana and layer it over the wafers.
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Pour 1/4 cup of the pudding mixture over the bananas.
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Repeat this three more times using the wafers, then bananas, then pudding mixture.
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In a small bowl, beat the egg whites at high speed until they become foamy.
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Gradually add the 1/4 cup sugar about a tablespoon at a time until soft peaks form in the meringue (this takes 3-4 minute to allow time for the sugar to dissolve).
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Add the 1/2 teaspoons vanilla and beat well.
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Spread the meringue over the pudding making sure to get it all the way to the edges of the pan to "seal" it.
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Bake, uncovered at 350 degrees for 20-25 minutes.