What is the primary ingredient used for steaming in a Venti Caramel Flan Latte?

The primary ingredient used for steaming in a Venti Caramel Flan Latte is milk. This beverage is typically crafted using whole or 2% milk, which is heated and aerated to create a creamy texture that enhances the overall flavor of the drink. The steaming process also helps to blend the milk with the espresso and flavorings, leading to a smooth and balanced beverage experience.

While eggnog, half-and-half, and almond milk can be used in various drinks at Starbucks, they are not the standard for a Caramel Flan Latte. Eggnog is commonly associated with seasonal drinks, half-and-half generally provides a richer, creamier option but isn't the base for this specific latte, and almond milk serves as a non-dairy alternative, which may be an option for some customers but isn't the primary ingredient for this drink. Therefore, milk is the essential component that defines the character of a Venti Caramel Flan Latte.