Coffee and Espresso Machines Espresso machines use pressure to push water through finely ground and tamped coffee beans. They produce a rich, tasty brew. Good Housekeeping Institute experts recommend models that use a minimum of 9 bars to ensure a perfect extraction. Beware of manufacturers that claim to use more https://www-coffeee-uk91567.canariblogs.com/10-great-books-on-coffee-machines-espresso-45050371