Jefferson's Cocktail The Manhattan Barrel Finished - 750MLA bottled Manhattan cocktail from Jefferson's bourbon created in collaboration with the editors of Esquire magazine! It's made with 6 year old Jefferson's Kentucky straight bourbon as well as sweet and dry vermouth (so it's what's known as a 'Perfect' Manhattan) and barrel aged spiced cherry bitters. It's then rested in an oak cask for 90 days. To serve, pour it over ice, stir, then strain into your glass.