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Coffee Machine Espresso Espresso coffee is made by forcing hot water under pressure through the grounds. There's a lot going on under the hood to ensure consistently high-quality coffee. Pressure and temperature of water are the two most important components. A good espresso machine allows you to regulate these variables to ensure consistent flavor and extraction. Types The top espresso machines utilize high-pressure to force hot water into coffee grounds that are tightly packed. This process produces 1-2 pounds (or more) of espresso, which is a concentrated