What is the main ingredient added to a Black Russian?

The main ingredient added to a Black Russian is Kahlua. This cocktail is traditionally made by combining vodka with Kahlua, which is a coffee-flavored liqueur. The flavor profile of Kahlua complements the vodka, creating a rich and robust combination that makes up the drink.

Kahlua is essential for providing the distinctive coffee taste that characterizes a Black Russian, setting it apart from other cocktails. The careful balance between the two main ingredients is what gives this drink its unique identity. Other ingredients listed do not match the traditional recipe for a Black Russian, as they do not contribute to the signature flavors of the cocktail.