Ladle out the eggnog into your fancy cups, and top with a bit more freshly grated nutmeg.
If the eggnog has separated, give it a quick (gentle!) stir before serving. Don't let the eggnog sit out too long - even if it does have alcohol, refrigerate to avoid spoilage. I've never had this problem: we always drink it so fast there's nothing left to worry about! Thankfully it's fast to make more, because you'll never be able to drink the commercial stuff again.