Ask Jack Daniel’s enthusiasts what they like most about their preferred whiskey and the term “consistency” comes up time and time again. According to Kevin Smith, a microbiologist who serves as the Distillery Manager of Reliability & Technical Services for the brand, “The character and consistency of our spirits are the result of several different factors, and that is what defines our terroir.” The concept of terroir expression in distilled spirits didn’t gain prominence until fairly recently, a shift driven both by research and best practices that determine desired flavors and character. While grain sourcing is proving to be a factor of this expression for single malts, the use of multiple grains – as seen in the Jack Daniel’s grain bill of 80% corn, 12% barley , and 8% rye – makes the influence of any one component more difficult to detect. “At Jack Daniel’s, we find that sourcing the highest-quality grains is far more important than the location in which the grains are grown,” Smith says. A grain bill is destined for conversion and …