(1) Sweet spiced hot milk curdled with ale or beer
(1) Spiced cider and the alcoholic posset were served hot, but the staple beverage everywhere was beer, beginning with breakfast.
(2) She chose the lemon posset from the traditional dessert menu, which also proved a hit, while Louis and I had coffee.
(3) A posset was a hot drink made from milk curdled with ale, wine, or other liquor, often with sugar, spices, and herbs added in.
(4) I think I love the names of trifles, possets , fools and syllabubs more than I enjoy eating them.
(5) There's more about possets , and a recipe, here.