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Espresso Coffee or café espresso and some call it “expresso” is a strong concentrated coffee drink that is brewed through steam pressure to produce thicker consistency coffee than regular drip coffee. Indeed, the most distinguishing characteristic of espresso coffee is the crèma which is the reddish-brown foam that floats on the surface of the espresso cup. The crèma is usually composed of proteins, caramelized sugar and coffee oil. Espresso coffee has higher amount of dissolved coffee solids than drip coffee served in a small demitasse cup and measured in shots (about one fluid ounce) than bigger cups or mugs of about 8 to 12 ounces per serving of drip coffee.
Developed Milan, Italy in the early 1900s, espresso coffee was produced by forcing water through finely ground coffee using steam pressure. Today espresso machines use a spring loaded piston.
The concentration and thickness in the espresso coffee allows the Baristas to create the base for other drinks like café latte, cappuccino coffee, macchiato, mocha, and Americana coffees.
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