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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 takes a while to warm up. Chris Morocco, Food Director Chris Morocco, Food Director, is a huge fan of espresso. He packs bags of coffee beans in his luggage each time traveling. He needs a machine that is reliable and fast. Pressure Espresso coffee makers make use of high pressure to force hot water into tightly pac