What distinguishes a single shot of espresso?

A single shot of espresso is characterized by its method of preparation, which involves forcing hot water through finely-ground coffee under high pressure. This process extracts intense flavors and oils from the coffee beans, resulting in a concentrated beverage that is rich in taste and has a creamy consistency. The distinct pressure brewing technique is what truly defines espresso, distinguishing it from other coffee preparation methods.

While decaffeinated options exist, the caffeine content does not define a single shot itself. Additionally, a single shot of espresso is actually smaller in volume compared to a double shot, which typically contains twice the amount of coffee. The idea of blending espresso with syrup does not apply universally, as traditional espresso is served on its own, allowing its robust flavors to shine through without additional sweetness. Thus, the defining characteristic of a single shot lies in its concentrated nature created through pressure brewing.