In a saucepan whisk together eggs, salt, and sugar. Gradually add 4 cups of milk. Cook and stir the mixture over low heat until the thermometer reads 160° to 170° for about 30 to 35 minutes.
Do not allow the mixture to boil. Immediately transfer it to a large bowl.
Stir in vanilla, remaining milk, and nutmeg. Place the bowl in a ice water bath, stirring until the milk mixture is cool.
(if the mixture separates, process in a blender until smooth).
Refrigerate, covered until cold for at least 3 hours.
To serve, beat the cream until soft peaks form. Whisk gently into the cooled milk mixture.
If desired, sprinkle with additional nutmeg before serving.