KJ Williams, a seasoned bartender at New York's Long Island Bar, shares his expertise in mixology and the vibrant history of the Angostura Sour. He reveals the cocktail's medicinal origins and how it evolved over time. KJ discusses the art of using bitters, emphasizing their versatility in both cocktails and cooking. He also delves into the importance of egg whites in cocktails, the nuances of ice selection, and the emotional connections patrons have with their favorite bars, all while crafting the perfect drinking experience.