In a large saucepan, stir together sugar and flour. Gradually stir in the milk. Bring to a boil over medium heat. In a small bowl, whisk egg yolks until smooth. Ladle a small amount of the hot milk into the yolks and quickly whisk in. Pour the tempered yolk mixture back into the hot milk. Cook, stirring constantly, until mixture comes to a boil. Remove from heat and allow to cool.
In a medium glass or metal bowl, beat egg whites until foamy. Gradually add4 teaspoons sugar, continuing to beat until stiff peaks form. fold whites into eggnog and refrigerate until chilled. Serve garnished with a dollop of whipped cream and a dash of nutmeg.
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