Judge a good Espresso

What is Espresso?

The high-pressure and fast brewing method of coffee is called "Espresso", that is, Espresso originally refers to a method of brewing coffee, and later the coffee brewed in this way is also called Espresso. A perfect cup of Espresso coffee is made by 7-8 grams of roasted coffee beans, ground into a very fine powdered coffee, after proper filling (20Kg), with 9 plus or minus 1 atmospheric pressure and 90 degrees plus or minus 2 degrees hot water, the 30CC coffee concentrate is extracted in 2530 seconds.

How to judge a good Espresso

People like to drink coffee because it releases flavor and aroma when it is brewed. The sources of flavor in coffee are mostly water-soluble, such as caffeine, protein, sugar and so on, while the sources of aroma are mostly insoluble, such as coffee oil. The volatile aroma of coffee oil is found in roasted coffee cells. Some of these oils are insoluble in water and only emulsify 10% when using an Espresso machine at high temperature and high pressure and float in the hot coffee juice, turning into a rich ochre red Crema. We can judge the quality of a cup of Espresso by the color, thickness, markings and other appearance of Krima.