What is the flavor of the pump identified as "PEP"?

The flavor identified as "PEP" refers specifically to peppermint. This designation is often used to signify a refreshing, minty flavor profile that pairs well with various beverages, especially during seasonal offerings like winter beverages or festive drinks. Peppermint is popular in coffee shops for its ability to enhance the overall flavor experience, providing a cooling sensation and a distinctive aroma that can complement both hot and cold drinks.

In the context of this question, it's important to recognize that peppermint is a widely recognized flavor in the beverage industry, making it a fitting choice. Other options like peach or strawberry refer to fruity flavors that do not align with the "PEP" abbreviation, and mocha sauce indicates a completely different flavor category associated with chocolate rather than mint. Hence, peppermint is indeed the correct flavor associated with the "PEP" pump.