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The piston, or lever, driven machine was developed in Italy in 1945 by Achille Gaggia, founder of espresso machine manufacturer Gaggia. The design generically uses a lever, pumped by the operator, to pressurize hot water and send it through the coffee grinds.
Espresso machines use 132 pounds per square inch of pressure to extract coffee, which differentiates it from brewed coffee, for example, which just uses gravity. One cup, traditionally, is seven grams of coffee, and should take no more than 25 seconds to make. Di Pietro says that espresso should not be bitter, and shouldn't give you heart palpitations. One of the huge issues I have with the new wave of coffee shops is that they make espressos with 18 to 20 grams of coffee.