How do Starbucks espresso order espresso? Is the espresso good?

Professional coffee knowledge exchange more coffee bean information please follow the coffee workshop (Wechat official account cafe_style)

Espresso has always had a very high status in the hearts of coffee lovers, not only because of its rich taste and pure Italian origin, but also because Espresso is not only a test of skill for baristas, but also a knowledge and love of coffee.

Hydraulic pressure

Modern coffee machines are much more advanced than early LAVA machines, with a water pump to control the amount of water and controllable water pressure. Espresso ideal water pressure is generally 9 BAR, which is generally recognized as the most ideal air pressure. The pressure of the boiler is related to the water temperature of making coffee and the impulse of steam. The higher the boiler pressure, the higher the water temperature and the greater the impulse of the steam; otherwise, the lower the water temperature, the smaller the steam. The boiler pressure is generally around 1 BAR, but there is still a lot of controversy about this number, and every barista has a different understanding. Water temperature depends on the needs of different varieties of coffee beans, some are subject to boiler pressure, some are more flexible and precise setting. According to the experience of most baristas, the water temperature is between 90 and 92 degrees Celsius, each barista can flexibly adjust according to their own understanding and needs, and can make their own style Espresso with their own hands. Packing force has various styles of packing. In this world, almost no two people's packing will be the same. Generally speaking, if it is heavy pressure, the required pressure will be the pressure like 25kg/m2, but packing is indeed the freest parameter in the golden rule.

Coffee bean grinding thickness

The grinding thickness will be related to many factors, such as climate, coffee bean baking degree, freshness, humidity, new and old bean grinder, and so on. There has always been a saying in the industry: "the right thing is that the grinding thickness is changing, and the wrong thing is that the grinding remains the same." The amount of Espresso powder for a single serving is 7 to 8 grams of coffee powder, and for a double serving is 15 to 16 grams. Extraction time according to the Espresso gold rule, the extraction time is between 22 and 28 seconds, but the extraction time is actually a comprehensive expression of packing pressure, powder quantity and grinding degree, which needs to be adjusted by the barista's understanding of Espresso. Extraction quantity Espresso single 30cc, double 60cc ml extraction amount almost no one will change, except for a few Italy will use a single serving of coffee powder but only extract 15ml coffee liquid coffee oil coffee oil complex can not be clearly explained by me in a few words, to put it simply, it requires a rich golden brown oil to be a good Espresso.