What process must Tennessee Whiskey undergo in addition to aging?

Tennessee Whiskey must undergo charcoal filtering, commonly known as the Lincoln County Process, in addition to aging. This process involves filtering the spirit through charcoal before it is aged in barrels, which is a significant step that distinguishes Tennessee Whiskey from other types of whiskey, like Bourbon. The charcoal filtering helps to mellow the spirit and refine its flavors, contributing to the smoothness that Tennessee Whiskey is known for.

The Lincoln County Process is a unique requirement that must be adhered to for a whiskey to be labeled as Tennessee Whiskey, reinforcing its identity and quality. It showcases the craftsmanship involved in producing this type of whiskey and emphasizes the tradition that underpins its production.

In contrast, the other choices represent processes or requirements that do not apply specifically to Tennessee Whiskey. For instance, extra distillation in a pot still is not a requisite for Tennessee Whiskey, as it can be produced in column stills as well. Fermenting with wild yeast strains does not specifically characterize Tennessee Whiskey, nor does the requirement to use only organic grains in production, which is more aligned with certain craft and artisanal distillation practices rather than the legal requirements for Tennessee Whiskey.