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Choosing the Best Ground Coffee For Your Espresso Machine If you own an espresso maker you'll need to ensure that the coffee you're using is of the highest quality. This is because espresso machines need a fine grind to extract the highest amount of coffee. Extraction happens when water passes through coffee grounds and extracts flavor chemicals that are responsible for your coffee's taste. A coarse grind can hinder your coffee from absorbing effectively, leading to the beverage being weak in flavor. Fine Gr