Eggnog originated as ale mixed with custard. In this version we return to the drink's roots with a creamy nitro stout, but also add Irish cream for extra flavor and strength. This recipe yields 6 to 8 servings.
Slowly add the nitro stout and Irish cream and stir very well.
Chill and serve.
(Any leftover quantity can be refrigerated in an air tight container. In case the drink smells strange or looks weird after being refrigerated for a few days, discard it)