here) but with the base liquor switched. My recipe came from Imbibe! by David Wondrich. Sage asked in the gin post where the sling name comes from. While I could find no definitive answer on this, Wondrich theorizes that it comes from the idea of "slinging back" a drink.
A sling really is the most basic cocktail concept, at least before bitters enter the mix: a liquor and a sweetener. And what better sweetener than sugar itself? I prefer the whiskey, as I find I do with most drinks given the option. I used rye.