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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 use is of the highest grade. This is because espresso machines require a fine grind to ensure the highest extraction. The water flows through the coffee grounds to extract flavor chemicals that create your coffee’s taste. A coarse grind will prevent the coffee from being extracted correctly, resulting in an unappealing beverage. For those with an espresso machine, getting the co