Eggnog

Eggnog is a special occasion punch made from raw eggs, milk, cream and a large quantity of sugar. It is traditional to add rum to taste, although burbon whiskey and other spirits may be used, and non-alcoholic versions are often served as well. Although its roots are in various European punches, eggnog (or egg nog) in its current form is uniquely American.

Commercial, packaged drinks called "eggnog" are available in supermarkets only during the "Holidays", in the United States, the period between Thanksgiving and New Year's Day. [but that's all right because they are altogether unpalatable, except for one brand which of course I can't name.]