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How an Espresso Coffee Maker Works The machine is easy to use but requires precision when grinding beans and tamping them. It takes a while to warm up. Food director Chris Morocco is into espresso and really enjoys it. He has bags of coffee beans in his luggage when travels. He is looking for a machine that is reliable and fast. Pressure Espresso coffee makers utilize high pressure to force hot water into tightly packed grounds. This pressure is crucial to the process of brewing bec