The espresso machine uses a pump-driven machine to force near-boiling water through finely ground coffee to extract its full flavor. The water is forced through with at least 9 bars of pump pressure for 20 to 30 seconds.
The resulting "shot" of liquid is thick and strong, and contains a dark oily layer on top known as the crema. Espresso coffee drunk "as is" is often referred to as a short black.
Hot frothed milk can also be added to an espresso shot in various proportions to make other popular café style coffee drinks including macchiato, cappuccino, flat white, and latte. To make quality espresso coffee at home, you'll need to by a good quality espresso machine.
