Which ingredient makes up the Green Hornet cocktail?

The Green Hornet cocktail is primarily made with brandy, which is the correct choice. Brandy, being a distilled spirit made from fermented fruit juice, usually grapes, provides a rich and fruity base for the cocktail. This spirit offers depth and complexity, allowing it to mix well with other ingredients while maintaining its distinct flavor profile.

In cocktails like the Green Hornet, brandy lends a smoothness that enhances the overall taste experience, complementing any additional sweeteners or bitters that may be included. This is especially important in cocktails where balance between sweetness and the spirit's characteristics is crucial.

While whiskey, rum, and vodka are all popular spirits used in various cocktails, they do not relate to the traditional formulation of the Green Hornet. Each of these spirits brings different flavor profiles and characteristics that would change the essence of the drink significantly.