How to judge the quality of black coffee?

I had a part-time job at COSTA Coffee when I was in college, and I tried to remember. . . For a long time, I'm not advertising, but I think COSTA coffee is really strict. That million-dollar insurance tongue is COSTA's coffee master. Of course, the actual operation varies from person to person. If we have to say that the standard of a good cup of espresso is to extract 30 ml of 7 grams of coffee powder within 20 seconds. This includes the size of coffee particles after grinding, the intensity of tamping, the control of water temperature and air pressure, the level of barista and so on. Therefore, every barista should check according to the standard before opening business or changing shifts every day, because each barista will have different efforts to suppress coffee. In short, if every shot is up to standard, it needs some practice. Here, I also want to talk about the shelf life of coffee beans. Generally, we open the bag for a week (it will be used up in a day or two), grind the coffee box for four hours, grind the jar for one hour, and extract it for 30 seconds. Otherwise all expenses will be reimbursed. Of course, some coffee machines are fully automatic. Just press a button and the barista can save trouble. Of course, consumers will also be curious about how long the beans have been in it. . . As for the taste, there are mainly four kinds of coffee beans, and there are two kinds commonly used in the market, Arabica coffee and Robusta coffee. The former contains less oil, so we mix them in a certain proportion (trade secrets and so on) to make the coffee more mellow and not dry. But there are people who don't like oil, but the oil of coffee is an important basis for judging its quality. So you ask how to judge, and you ask others how to answer? You said it was delicious. As for the taste, what should it be like? If you taste it carefully, there are sour, astringent, bitter and sweet. Of course, the last one is generally not felt, as well as coke and charcoal coffee, all of which are the flavors of coffee that have been burned for a long time, but some people like to drink it. Finally, I want to sigh that I can remember my own affairs so clearly at once. Correction://* Finally, black coffee is also called American coffee, English is American coffee, and some people call it black coffee. What I said above is espresso, which is black coffee with water. Personally, if you order this American coffee, you'd better not use black coffee, otherwise some baristas will think you are arrogant.

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