WSET Level 2 Spirits Practice Exam 2025 – Complete Prep Guide

The term "sour mash" in Tennessee whiskey production refers specifically to the process of using a portion of the fermented mash from a previous distillation as a starter for fermentation. This methodology introduces lactic acid and other beneficial microorganisms into the new mash. This helps to control the acidity and enhance the overall flavor profile of the whiskey while also fostering a healthy fermentation environment. The acid from the sour mash can inhibit undesirable bacteria and contribute to a consistent and high-quality product.

The addition of acidic residue plays a crucial role in the fermentation process, ensuring that the yeast can thrive, which ultimately leads to the desirable characteristics associated with Tennessee whiskey. This process can impact the final taste by adding layers of complexity and a hint of sourness, distinguishing Tennessee whiskey from other styles.

In contrast, the other options do not accurately describe the sour mash process. For instance, the use of wild leavening agents is not characteristic of sour mash whiskey production; instead, controlled fermentation is preferred. Additionally, the term does not refer to the source of grains or indicate any quality metrics regarding the whiskey itself. Instead, it highlights a traditional technique integral to producing distinctive and high-quality Tennessee whiskey.