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Coffee Machine Espresso Espresso coffee is produced by forcing hot water under pressure through the grounds. There's a lot that goes behind the scenes to ensure consistent quality. The main elements are water temperature and pressure. A good espresso machine will allow you to control these variables for consistency in flavor and extraction. Types The top espresso machines utilize high pressure to push hot water through tightly packed coffee. about 1-2 ounces of the concentrated form of coffee referred to as espre