What does the term "single shot" refer to in brewing espresso?

The term "single shot" specifically refers to a one 1-ounce serving of espresso. In espresso brewing, a single shot is created by forcing hot water through finely-ground coffee at high pressure, resulting in a concentrated coffee beverage. This one-ounce quantity is standard and is the base for many coffee beverages. Understanding this measurement is essential for baristas and coffee aficionados alike, as it forms the foundation of many espresso-based drinks.

The other options either describe alternative quantities or types of espresso. For instance, two ounces would typically describe a double shot, and espresso brewed with milk would refer to beverages like lattes or cappuccinos, which are made using shots of espresso combined with milk rather than being classified as single shots themselves. Thus, the definition of a single shot as one ounce is clear and foundational in coffee preparation.