Caffe' expresso is a concentrated beverage brewed by forcing hot water under pressure through finely ground coffee. Generally, one uses an expresso machine to make expresso, although there are stove top expresso makers and hand operated devices such as the AeroPress. The act of producing a shot of expresso is often termed "pulling" a shot, originating from lever expresso machines which require pulling down a handle attached to a spring-loaded piston, forcing hot water through the coffee at high pressure. Today, however, it is more common for the pressure to be generated by steam or a pump.
More info: http://en.wikipedia.org/wiki/Espresso
Recipes: http://www.coffeeandteawarehouse.com/index.cfm?method=pages.ShowPage&pageid=101 , http://www.espressozone.com/espresso-recipes.aspx , or http://academic.scranton.edu/student/JENKINSL2/recipes.html
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