What would you add to a chiller if a customer wanted a caffeine boost?

When a customer requests a caffeine boost in their chiller, adding espresso is the most effective solution. Espresso is a concentrated coffee beverage that contains a significant amount of caffeine compared to other ingredients. By incorporating espresso into the chiller, you enhance its flavor profile while significantly increasing the caffeine content, providing the desired energy boost.

Other options, such as fruit juice, flavored syrup, and sugar, do not deliver caffeine. Fruit juice might add flavor and natural sugars, but it lacks any caffeine benefits. Flavored syrup can enhance taste but often contains no caffeine as well. Sugar may provide a quick energy spike but does not contribute to caffeine levels. Therefore, espresso stands out as the ideal additive for those seeking increased caffeine in their chiller.