George Dickel Tennessee whiskies are made with a mash bill (whose proportions are secret) of barley, rye, and corn. Blended down with limestone water from Cascade Hollow, the whiskey is "mellowed" through sugar maple charcoal, double distilled, and then aged in oak. One of their signature processes is to chill-filter the spirit before the charcoal mellowing, which they say creates a special smoothness to their whisky. Note that the distillery has opted to spell whisky without the "e" in defiance of American whiskey tradition (and we'll follow suit here).