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How an Espresso Coffee Maker Works The machine is simple to use, but it requires precision when grinding and tamping beans. It also takes a long time to warm up. Chris Morocco, Food Director Chris Morocco, Food Director, is a huge fan of espresso. When traveling, he carries bags of coffee in his suitcase. He needs a machine that is reliable and efficient. Pressure Espresso coffee makers make use of high-pressure pressure to force hot water through the tightly packed groun