It’s not just the novelty of it: For those who hanker for the rich, creamy and boozy, beernog is one of those rare gestalts. By itself, homemade eggnog is nearly unrivaled for sheer naughtiness and holiday cheer. Yet a portion of strong ale—barleywine, Belgian strong, Christmas beer—adds a welcome flavor dimension while carbonation lightens the thick, noggy texture in the same way that root beer livens up an ice cream float. Start with your favorite imperial stout; roasted and caramelized malts marry the creamy sweetness and spices for a heartwarming holiday union. –Joe Stange