A cosmopolitan, or informally a cosmo, is a cocktail made with vodka, triple sec, cranberry juice, and freshly squeezed or sweetened lime juice. While the cocktail is widely perceived to be a more modern creation, there is a recipe for a Cosmopolitan Daisy which appears in Pioneers of Mixing at Elite Bars 1903–1933, published in 1934.
Shake all ingredients in cocktail shaker filled with ice.
Strain into a large cocktail glass.
Garnish with lime slice and serve.