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Coffee Machine Espresso Espresso coffee is produced by forcing hot water under pressure through grounds. There's a lot that goes behind the scenes to ensure the same quality of coffee. The key elements are water temperature and pressure. will allow you to manage these variables for consistency in flavor and extraction. Types The top espresso machines utilize high-pressure to push hot water into coffee grounds that are tightly packed. This method produces 1 to 2 ounces (or more) of espresso, a concentrated form of coffee. It also produces the characteristic cr