What technique is commonly used to chill a glass before serving a cocktail?

Chilling a glass with ice and water is a widely accepted technique in bartending to prepare it for serving a cocktail. This method not only cools the glass quickly and efficiently but also helps ensure that the cocktail remains cold for a longer period once poured. The ice provides immediate cooling, while the water enhances the chilling effect by surrounding the glass evenly, allowing for a consistent temperature throughout.

In contrast, warming the glass and rinsing it with hot water would have the opposite effect, as these techniques increase the temperature of the glass, which is undesirable when preparing drinks that are meant to be served cold. Placing a glass in the freezer can also be effective; however, it takes more time and is not as immediate as chilling with ice and water. In a busy bar environment, quick methods are preferred to maintain efficiency, making the ice and water technique particularly popular among bartenders.