Which of the following is included in the recipe for a Moscow Mule?

The Moscow Mule is a classic cocktail known for its refreshing taste and distinctive presentation in a copper mug. One of the key ingredients that define a Moscow Mule is ginger beer. This beverage provides the cocktail with its signature spicy and slightly sweet flavor profile, which pairs perfectly with the other ingredients, usually vodka and lime juice.

Ginger beer is a carbonated beverage made from ginger, sugar, and water, and it is essential to the Moscow Mule's identity. The strong ginger flavor not only adds depth but also creates a nice effervescence that enhances the overall drinking experience. Without ginger beer, the Moscow Mule would not have its characteristic taste, making it an indispensable ingredient in the recipe.

The other options present flavors that do not traditionally belong in a Moscow Mule. Lemon juice, simple syrup, and peach schnapps do not contribute to the authentic formulation of this cocktail and would fundamentally change its intended flavor profile.