The Old Fashioned is arguably one of the most suave sippers out there. The Rum Old Fashioned is a spiffy spinoff of the original, which turns it into a dapper rum and falernum cocktail. Falernum (fah-learn-um) dates back to the 18th century. This spiced, sweet and tart syrup adds an irreplaceable zing and complexity to this drink, taking it into a brand-new cocktail space.