Iced drinks are built in what?

Iced drinks are built in a mix cup because this allows for the proper blending of ingredients before serving. The mix cup is specifically designed to combine liquid ingredients, whether that involves adding flavor syrups, espresso, or milk, ensuring each component is mixed evenly. This method helps maintain the drink's desired consistency and flavor profile before it is poured into the serving cup.

In contrast, a serving cup is where the final drink is presented to the customer, while a shaker is typically used to combine ingredients for cocktails or drinks that require aeration or froth. A blender is used for drinks that need to be pureed or crushed, such as smoothies, but is not standard for building iced coffee drinks where layering and mixing are key rather than blending. Thus, the mix cup is the appropriate vessel for constructing iced drinks efficiently and effectively.