How Does Machine Espresso Work? The machine espresso utilizes precision pressure, and filter technology that is mind-blowing to create the coffee you love. What exactly is it? To make espresso, hot water is pushed under pressure through finely ground coffee. The process is similar to that of making drip coffee. https://www.coffeee.uk/products/quest-36569-espresso-machine-with-milk-frother-15-bars-pressure