What ingredient is commonly used to top a cappuccino?

Cocoa powder or cinnamon is commonly used to top a cappuccino for a couple of reasons. First, cappuccinos are traditionally composed of equal parts espresso, steamed milk, and milk foam. The addition of cocoa powder or cinnamon enhances the drink's flavor profile and offers a balance to the strong espresso and creamy milk components. These toppings also contribute to the drink's aromatic qualities, making it more appealing to the senses.

Cocoa powder adds a rich chocolatey note, while cinnamon introduces a warm spice, both of which can complement the flavors already present in the coffee. This practice aligns with traditional Italian coffee culture, where minimal toppings emphasize the quality of the espresso.

Toppings like whipped cream, chocolate syrup, or caramel drizzle deviate from the traditional preparation of a cappuccino. These ingredients, while popular in other coffee beverages, can overwhelm the delicate balance and structure that a true cappuccino aims to maintain. Thus, using cocoa powder or cinnamon reflects the classic approach to crafting this drink.