A reminder, as I sit here with a delicious glass of syllabub: if the recipe calls for milk and booze or milk and citrus, put the sugar in the milk first, or you’ll end up with cheese.
Warm the cream a little so the sugar mixes in more thoroughly – 10 seconds in the microwave should take the chill off of it. Mix the sugar in REALLY WELL. Like, whip that for half a minute or more, to be sure it’s blended. Mix in the sherry, and then the lime. Sprinkle nutmeg on top. MAAAGIC.