Final answer:
When flavor is added to a freeze, always build the drink in a mix cup to achieve an even flavor distribution.
Step-by-step explanation:
When a freeze is ordered with flavor, the correct procedure is to build the drink in a mix cup. This ensures that the flavor is evenly distributed throughout the entire drink, creating a consistent flavor profile. For instance, if you are using ingredients as simple as cocoa powder or vanilla extract, or even more elaborate flavors like pomegranates or pistachios, blending them in a mix cup would integrate these flavors more thoroughly compared to adding them into the serving cup directly.