How Does Machine Espresso Work? The machine espresso is made using precision pressure, and a filtering system that is awe-inspiring to make the coffee you enjoy. What exactly is it? Espresso is made by forcing hot water under pressure through finely-ground coffee. The process is similar to making drip coffee https://www.coffeee.uk/products/swan-retro-pump-espresso-coffee-machine-blue-milk-frother