Moscow Mule

Invented in 1941 by John Martin of the Heublein Company (distributors of Smirnoff Vodka) and Jack Morgan (owner of the Cock n' Bull restaurant) as a way to popularize Vodka, Ginger Beer, as well as unload an excess of copper mugs.

For a long time, the special copper mugs could only be found in antique stores or auction sites, but recently the Cocktail Kingdom started selling them. You can find them here.

Moscow Mule

2 ounces vodka
1 ounce lime juice
3 ounces ginger beer

Garnish: Lime wedge

Build in an ice filled highball glass (or copper mug)

Source: John Martin (1941)