How Does Machine Espresso Work? Machine espresso utilizes precise pressure and amazing filter technology to make the perfect cup of coffee. How exactly does it work? To make an espresso hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee, but https://www.coffeee.uk/products/salter-ek4369-caffe-barista-pro-espressokocher-15-bar