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Choosing the Best Ground Coffee For Your Espresso Machine If you own an espresso machine, you'll be looking to ensure that your ground coffee is of top quality. This is because espresso machines require a fine grind to ensure the highest extraction. Extraction is when water passes through coffee grounds and extracts flavor chemicals responsible for the flavor of your coffee. A coarse grind can hinder the coffee from separating properly, which results in a weak tasting beverage. Fine Grind If you have an espre