Some people associate swizzles with summertime, likely because they're frequently mixed with rum and styled with a tiki bent. But something about the heaping piles of shimmering crushed ice that form the base of these drinks has, for me, always brought snow to mind. And while rum makes for a perfectly good swizzle cocktail, even in the winter, I use a split base of sherry and aquavit (a Scandinavian spirit with strong anise notes) to push this drink recipe more firmly into the chilly months.