Whisk the egg together with the milk, salt and nutmeg.
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<br>Add the mixture to a buttered mold (perhaps a coffee cup), cover, and set into a hot water bath.
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<br>After the egg has become solid, remove it and cut it into bite-sized cubes.
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<br>Add the egg to the heated stock, and garnish with parsley and chives before serving.
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<br>That's it.