It is made from egg yolks, sugar, and flavourings such as honey, vanilla, cocoa or rum, rather close to eggnog.
en.wikipedia.org Before the widespread availability of electric blenders, milkshake-type drinks were more like eggnog, or they were a hand-shaken mixture of crushed ice and milk, sugar, and flavorings.
en.wikipedia.org Eggnog, a milk-based punch that is often infused with alcohol, is also very popular around the holiday season.
en.wikipedia.org In fact, some modern recipes recommend letting eggnog sit for a few days up to a few weeks for this exact reason.
www.eater.com Though eggnog is high in fat and cholesterol, low-fat and no-sugar formulations are available using skimmed or lowfat milk.
en.wikipedia.org