The Cosmopolitan Cocktail seems to have it's purported roots in the hands of modern mixology. With so many bartenders staking claim on it's creation... there is no way of knowing exactly where it was invented... It does seem to be generally recognized as a drink since the late 1980s and since then... it's popularity has skyrocketed to it's current stature as the quintessential 'martini cocktail'. Made with vodka (originally 'citrus' vodka), triple sec & cranberry juice, squeeze of lemon (lime has taken hold here) and give it a good shake. Cheers! Stay thirsty my friends!