What is the primary component of a green tea latte besides matcha?

The primary component of a green tea latte, aside from matcha, is steamed milk. In a green tea latte, matcha powder is blended with steamed milk to create a creamy, smooth beverage. The steamed milk not only enhances the flavor but also provides a rich texture that complements the earthiness of matcha.

Other ingredients like cream, foam, and regular coffee may be used in different types of drinks, but they are not foundational to the preparation of a green tea latte. Cream might add richness, but it is not the standard for this specific drink. Foam can be used as a topping in coffee drinks, but it does not serve as the main component of a latte. Regular coffee is completely different from the matcha base used in a green tea latte. Therefore, steamed milk is essential for achieving the signature taste and mouthfeel of this beverage.