Coffee and Espresso Machines Espresso machines make use of pressure in order to make water into finely ground and tamped beans. They make a rich, delicious cup. Good Housekeeping Institute experts recommend models that are brewed at a minimum of 9 bars for a perfect extraction. Beware of companies that https://www.coffeee.uk/products/swan-retro-pump-espresso-coffee-machine-blue-milk-frother