Most likely considered to be the classic recipie for

Cosmopolitan

Ingredients

1 1/2 fluid ounces lemon vodka
1 fluid ounce Cointreau
1 fluid ounce cranberry juice
2 teaspoons freshly squeezed lime juice
Long thin piece orange zest, and of course ice cubes.

Directions

Fill a cocktail shaker with ice. 

Add vodka, Cointreau, cranberry and lime juices. Cover and shake vigorously  Strain the cosmopolitan into a chilled martini glass. 

Twist the orange zest over the drink and serve. 

Note: The drink can also be stirred in a pitcher.

http://www.foodnetwork.com/recipes/cosmopolitan-recipe/index.html