![]() ![]() This forces the hot water through the ground coffee and out of the spouts. This engages the micro-switch that starts the pump, which pressurizes the heating chamber and hot water to about 15 atmospheres (220 psi) of pressure. You then turn the valve to the espresso position. ![]() You install the porta-filter by twisting it into the machine, and you place one small cup beneath each spout. Let's take a look at what happens to the coffee in an espresso machine. Sometimes the grind is adjusted to control the brewing time. Generally, for the best shot of espresso, it should take about 25 seconds for the water to pass through the coffee. The more finely the coffee is ground, the slower the espresso comes out. The consistency is almost like powdered sugar. The beans are ground very finely - much finer than for drip coffee makers. The beans are roasted until they are dark and oily-looking. The CoffeeĮspresso coffee is a blend of several different types of coffee beans from different countries. Let's start with one of the most crucial variables: the coffee. The skilled espresso maker, or barista, controls all of these variables to produce a quality shot of espresso. The temperature of the water, the pressure of the water, the fineness of the ground coffee and how tightly the coffee is packed are just a few. There are many variables in the process of making a shot of espresso. ![]()
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