It's like a martini but made with citrus vodka instead.
Invented in the 80s, popularized by Sex and the City, and still a regular order to this day.
Shake all ingredients for at least 20 seconds in a standard shaker. Serve up (in a cocktail glass), just like a martini.
Tip: If you like Cosmopolitans but don't want such a flashy drink, consider a Kamikaze.