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Combine sugar, flour and salt in saucepan; Stir in milk and cook over medium heat until thick. (Be careful not to scortch pan).
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Beat egg yolks, temper egg yolks by adding two tbsp of hot mixture to yolks then yolks to hot mixture.
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Cook for 5 minutes; remove from heat, stir in vanilla.
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In a 9x13 pan place a single layer of vanilla wafers on the bottom of the dish and up the sides.
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Place banana slices over cookies, top with pudding and chill in refrigerator.
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Before serving top with real whip cream. (Some people prefer meringue or cool whip which is fine but I think a 1/2 pt of heavy whip cream beat with 2 tbsp of sugar is the icing on the pudding).