Cosmopolitan
A cosmopolitan, or, informally, a cosmo, is a cocktail made with vodka, Cointreau, cranberry juice, and freshly squeezed or sweetened lime juice. The cosmopolitan is a member of the Gimlet family of cocktails. Though often presented far differently, the cosmopolitan also bears a likeness in composition to the kamikaze shooter. The International Bartenders Association recipe is based on citron vodka, lemon-flavored vodka. The use of citrus-flavored vodka as the basis for this cocktail appears to have been widely popularized in the mid-1990s by cocktail expert Dale DeGroff and is used in the IBA-approved recipe. Many bartenders, however, continue to use a standard unflavored vodka — this alternative would undoubtedly be historically consistent with any of the supposed predecessors of this drink that were popular in Ohio, Provincetown, or Minneapolis during the 1970s, or in San Francisco during the 1980s. A lemon twist is sometimes used to garnish.
Source: Wikipedia