Which cocktail is traditionally served in a copper mug?

The Moscow Mule is traditionally served in a copper mug, which is not only part of its signature presentation but is also significant for a few reasons. The use of a copper mug serves a practical purpose; it helps to keep the drink cold and enhances the crisp, refreshing taste of the cocktail, which typically combines vodka, ginger beer, and lime juice. The temperature of the drink is part of the experience, and the copper conducts cold temperatures exceptionally well.

Additionally, the Moscow Mule has a historical connection to the copper mug, as its origins trace back to the 1940s when the drink was popularized in the United States. The unique presentation in the copper mug has contributed to the cocktail's identity and has made it distinct compared to other drinks, such as the Mint Julep, which is usually served in a silver or pewter cup, the Old Fashioned served in a rocks glass, and the Mai Tai served in a variety of glassware, but not typically in a copper mug.