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Eggnog in general, and aged eggnog in particular, is a descendant of something called “sack posset “ or “posset,” a 17th-century, upper-class, custard-like, creamy English drink made with a fortified wine like Madeira or sherry.

"Lots of babies cry, or they posset, or they get a little minor rash or something," said Michael Perkin, a pediatric allergist based in the U.K.

If a zingy, citrus-based pud is more up your street, this effortless lemon posset only has three ingredients and takes five minutes to make.

While possets can contain a variety of ingredients — ranging from ginger to star anise — the Queen actually liked hers quite simply made with just lemon, sugar, cream and Amaretti cookies.

In its place now is a delicate lemon posset with an intense sauce of pulped passion fruit.