Said to have the kick of a mule, this cocktail is made by filling a copper mug (the traditional container) or glass with ice cubes and adding a generous amount of vodka (2 to 3 ounces), a squeeze of lemon or lime juice and topping with ginger beer. A Moscow mule is garnished with a lime wedge and a cucumber stick. The drink was developed in the late 1940s as part of a Smirnoff vodka promotion and has been popular ever since.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.