Genuine. Kentucky sour mash. ezrabrooks.com. Still bottled at an honest 90 proof, and aged the old fashioned way - in new, charred, American white oak barrels, Ezra Brooks is then charcoal filtered for an unmistakable, unforgettable mellow flavor. Charcoal mellowed. A genuine sour mash bourbon, made using the finest ingredients available. For generations, Ezra Brooks whiskey has been the whiskey for those with a rugged spirit and taste for adventure. Sour mash. 45% alc/vol (90 proof). Distilled & aged in Kentucky by Ezra Brooks Distilling, Louisville, Kentucky, USA.