What is a common characteristic of a mocha coffee?

A mocha coffee is characterized by its specific combination of ingredients, which includes espresso, chocolate, and steamed milk. This blend creates the drink's signature rich and creamy flavor. The presence of chocolate distinguishes it from other espresso-based drinks such as lattes or cappuccinos, which typically do not include chocolate as a primary component.

The other options do not accurately reflect the nature of a mocha. While a mocha can be served hot, it is also popular as an iced beverage. The brewing method is not restricted to a percolator; it can be made using an espresso machine or even a stovetop espresso maker. Whipped cream is often used as a garnish for presentation and added flavor, but it is not a mandatory component of a mocha coffee. Thus, the defining aspect of a mocha resides in its combination of espresso, chocolate, and steamed milk.