Overview of Espresso
Espresso is brewed by forcing hot, pressurized water through finely ground coffee beans, resulting in a small, concentrated, intense beverage with a layer of crema foam. The process involves early espresso machines that used large hot water boilers to build pressure for water and steam extraction.
Key Elements of Espresso Brewing
- The Golden Ratio: A guideline for the dose of coffee grounds compared to the yield of liquid espresso. Making good espresso requires an iterative process.
- Unique Phases: Espresso consists of small oil droplets that enhance flavor, suspended coffee solids, and a layer of gas bubbles/foam.
- Shot Time and Dripping: The ideal espresso shot time is 25-35 seconds, balancing flavor and aroma extraction. Drips should last 7-9 seconds with proper distribution of grounds and tamping pressure.
Serving and Variants of Espresso
Espresso can be enjoyed on its own or used as the base for beverages like cappuccinos and café lattes. While you can mimic espresso-like flavor with strong coffee brewed in regular machines, true espresso requires specific equipment and techniques.