Finely divided coffee beans, specifically prepared for use in espresso machines, are essential for creating the rich, concentrated beverage known as espresso. This specific preparation differs from coffee intended for other brewing methods, such as drip or French press. The difference lies primarily in the fineness of the grind, which allows for optimal extraction under the high pressure of an espresso machine.
Using appropriately prepared coffee is paramount to achieving a quality espresso. The correct grind size ensures proper water flow and extraction time, preventing over-extraction (bitter taste) or under-extraction (sour, weak flavor). The historical development of espresso, from its origins in early 20th-century Italy, has always emphasized the importance of the grind in conjunction with pressurized brewing. This careful attention to the preparation of the coffee contributes to the distinct crema, the characteristic reddish-brown foam that sits atop a well-pulled shot.
