Why Does A Moscow Mule Have To Be In A Copper Cup?
A Moscow Mule is traditionally served in a copper cup because it is believed to enhance the drinking experience by keeping the drink cold for longer periods of time. The copper cup also adds a unique aesthetic element to the drink. Additionally, the acidic lime juice in the cocktail can react with the copper, adding a subtle flavor to the drink. Finally, as the Moscow Mule was invented as a means to promote the use of vodka, a then unpopular spirit in the United States, the copper cup was used as a marketing technique to distinguish the drink and its unique serving vessel from other cocktails of the time.