Four principles to be followed in making an Italian Espresso

(1) the quantity of coffee beans must be standard, generally 14-16 grams per cup, using good quality deep-roasted coffee beans.

(2) the grinding powder should be of appropriate particle size, not too coarse or too fine. Coffee bean grinding is too coarse or too fine to make thick and delicious espresso, when the coffee powder is too coarse, the coffee gap in the filter bowl is too big, the resistance to water is not enough, the coffee flow rate is too fast, it is easy to cause insufficient extraction, and the coffee is tasteless; coffee powder grinding too fine resistance to water, hot water staying in the filter bowl for too long, the flow rate is too slow, easy to cause excessive extraction, coffee is too bitter.

(3) the amount of water and temperature of the coffee machine must be set.

(4) baristas' craftsmanship: this is the most important technology. if baristas do not understand coffee, professional knowledge and technology are not enough, even the best coffee beans, bean grinders and coffee machines are useless, so baristas have to be motivated and enthusiastic about coffee. in order to ensure the quality of each drink.