In a Moscow Mule, what ingredient is typically combined with vodka?

In a Moscow Mule, ginger beer is the key ingredient that is traditionally combined with vodka. This beverage is known for its refreshing and mildly spicy flavor profile, which comes from the ginger in the ginger beer. The combination of vodka and ginger beer, along with fresh lime juice, creates a drink that is served over ice, often in a copper mug.

The use of ginger beer is essential to the identity of a Moscow Mule, as it contributes both carbonation and distinct flavor characteristics that differentiate it from other cocktails. Other options listed, such as cranberry juice, club soda, or lemonade, do not align with the traditional recipe and flavor profile of a Moscow Mule. Each of these alternatives might work in different drinks but are not appropriate substitutes for ginger beer in this specific cocktail.