The Undertaker Cocktail is a dark and mysterious drink that is perfect for Halloween parties or spooky-themed events. This cocktail combines the rich flavors of bourbon, blackberry liqueur, and bitters, creating a smooth and slightly sweet beverage. The deep purple color adds to its eerie appeal, making it a visually striking choice. Serve this chilling concoction in a martini glass garnished with a blackberry or a sprig of rosemary for an extra touch of macabre elegance.