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Choosing the Best Ground Coffee For Your Espresso Machine If you own an espresso machine you will need to ensure that your ground coffee is of top quality. This is because espresso machines require a fine grind to ensure the best extraction. Extraction occurs when water flows through coffee grounds and extracts flavor chemicals that are responsible for the flavor of your coffee. A coarse grind can stop your coffee from extracting correctly, which results in an unappealing beverage. Fi