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Coffee Machine Espresso Espresso coffee is made by forcing hot water under pressure through grounds. There's going under the hood to ensure consistent quality. The main elements are water temperature and pressure. A good espresso machine 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 through tightly packed ground coffee. This method can brew 1-2 grams of the concentrated version of coffee, r