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How an Espresso Coffee Maker Works The machine is easy to operate, but requires accuracy when grinding beans and tamping them. It takes a while to warm up. Chris Morocco, Food Director Chris Morocco, Food Director, is a huge fan of espresso. He has bags of coffee beans in his luggage whenever travels. He needs to have a machine that is reliable and fast. Pressure Espresso coffee makers use high pressure to press hot water into tightly packed grounds. This pressure is crucial to the brewing process since it en