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Coffee Machine Espresso Espresso coffee is made by forcing hot water under pressure into the grounds. There's a lot going under the hood to ensure the same quality of coffee. Pressure and temperature of water are the two most important factors. 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 force hot water into tightly packed coffee grounds. This method brews 2 to 3 ounces o