QUESTION: What is Eggnog?

ANSWER: It’s the marmite of festive beverages. Love it or hate it, eggnog at Christmas is here to stay. The drink actually dates back to the medieval posset with the ‘nog’ referring to ‘noggin’: a middle English word that refers to a wooden mug used to serve alcohol.

Source: marieclaire.co.uk/life/christmas-traditions-answered