What is the standard amount of foam for a hot white mocha?

The standard amount of foam for a hot white mocha is typically no foam. This is because the focus of a white mocha drink is on the rich and creamy texture created by the steamed milk and the flavor of the white chocolate. Adding foam would alter the intended experience, which emphasizes the smoothness and sweetness of the drink rather than introducing airiness. Therefore, serving it without foam allows customers to enjoy a velvety beverage that highlights the balance of flavors in a white mocha.

In contrast, other options like varying amounts of foam would not align with the intended texture or customer expectation for this specific drink, which is designed to be indulgent and creamy without the lightness that foam would introduce.