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Choosing the Best Ground Coffee For Your Espresso Machine If you own an espresso machine you will want to make sure that the coffee you grind is of the best quality. This is because espresso machines need a fine grind to extract the highest amount of coffee. Extraction is when water passes through coffee grounds and extracts flavor chemicals responsible for the flavor of your coffee. A coarse grind will stop the coffee from separating correctly, leading to a the beverage to be weak in flavor. Fine