#sourmash #moonshine #philbillymoonshine Sour mash is a traditional technique used primarily in whiskey production, most famously associated with Tennessee whiskey and many bourbons. It involves incorporating a portion of the acidic liquid leftover from a previous distillation run – known as "backset" or "stillage" – into the next fresh batch of grain mash being prepared for fermentation. Sometimes, as shown in this video, leftover grains from the previous run are also included. Despite the name