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How an Espresso Coffee Maker Works The machine is easy to use, but it requires precision when grinding and tamping beans. It also takes a long time to warm up. Chris Morocco, Food Director, is a big fan of espresso. He packs bags of coffee beans in his luggage each time travels. He wants a machine which is reliable and fast. Pressure Espresso coffee makers utilize high pressure to force hot water into tightly packed grounds. This pressure is essential to the brewing process as it ensures that all flavors and aromas are extracted from the ground bean