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Choosing the Best Ground Coffee For Your Espresso Machine If you own an espresso machine, you'll need to ensure that the coffee you grind is of top quality. This is because espresso machines require a fine grind for the highest extraction. Water passes through the grounds of the coffee to extract the flavor chemicals responsible for the taste of your coffee. A coarse grind will prevent the coffee from extracting correctly, which results in an unappealing beverage. Fine Grind The proper grind is vital