Hand-made coffee grinding thickness according to the hand-made coffee powder need to be ground? How do you grind it?

More and more people like to drink coffee and make their own coffee. the rise of hand-brewed coffee has led to a trend of "making their own coffee". However, for some beginners, even if the enthusiasm is high, it is still impossible to accurately master the correct brewing skills, so that they are unable to show the good flavor of coffee, or even make a bad cup of coffee.

How does the grinding thickness of coffee beans affect the flavor?

Hand coffee is to use water as a solvent to release the flavor substances in the ground coffee powder, so as to get a delicious cup of black coffee. Coffee grinding degree is the top priority of hand-brewed coffee, and the thickness is directly related to the amount and speed of the release of various ingredients in coffee.

Every day when we go to the coffee shop, we can notice that espresso uses a separate bean grinder, because espresso takes tens of seconds to extract a thick cup of espresso coffee, so it needs to be ground very finely and evenly. Although hand-brewed coffee does not have to be as fine as Italian, but if you want to show a positive flavor, you still need to grind evenly and find the corresponding degree of grinding.

The coarser the grinding, the larger the particles, the smaller the resistance to the water flow, the shorter the time to pass through the powder layer, and the lighter the flavor of the extraction; the finer the grinding, the smaller the particles, the greater the resistance to water flow, the longer the time to pass through the powder layer, and the more time the powder is exposed to, and the taste is naturally thicker. Uneven grinding of coffee powder, hot water and different sizes of particles contact time is different, extraction efficiency is different, coffee taste will also be affected.

How fine should the hand punch be ground?

Only 30% of a coffee bean can be dissolved and explained, and only part of this 30% is the positive flavor we want, and the rest is to make the coffee bitter and miscellaneous, so the adjustment of the parameters in the hand is to grasp the proper extraction. According to the summary of the coffee people in the industry, the extraction efficiency is better at 18-22%.

When cooking, people like to directly ask how rough Qianjie mill is, because the degree of grinding is not as specific as the water temperature, how thick and fine it is can only be observed and compared through its own experience. Qianjie is usually described as granulated sugar as a reference for grinding. For example, when cooking light roasted coffee beans in Qianjie, the lighter the roasted coffee beans are, the weaker the water absorption is. If you want to improve the extraction efficiency, you will choose medium and fine grinding, that is, the size of fine sugar, as shown in the figure below.

When roasting coffee beans in depth, the baking degree is deepened, and the water absorption of fluffy beans is higher. To avoid excessive extraction, it is recommended to use medium thickness, that is, the size of coarse sugar.

For more rigorous pursuit of small partners, can not only be described by sugar particles, if you want to accurately get their own bean grinder corresponding to the degree of grinding, Qianjie suggests the use of professional inspection tools, that is, the Chinese standard 20 0.85mm aperture screen. When using a sieve, the small particles within the 0.85mm will fall into the powder bowl below, while the large particles exceeding the 0.85mm will remain on the net. Sieving is the proportion of coffee powder in the powder bowl. The grinding thickness of medium-shallow roasted coffee beans is 75-80%, corresponding to the Qianjie EK43s bean grinder scale of 10-10.5, and the grinding thickness of medium-deep roasted coffee beans is 70-75%, corresponding to 10.5-11 scales.

In addition to the above two ways of judgment, the appropriateness of grinding can be observed directly according to the hand-punching process, and the extraction time needs to be used as a reference factor here. The previous street brewing parameter standard, the normal extraction time of a cup of coffee is about 1 minute 50 seconds to 2 minutes 10 seconds. If the grinding is too fine, the extraction time will be prolonged, and if the grinding is too coarse, the extraction time will be shortened, so that the coffee grinding degree can be judged for the first time according to the extraction time.

What other details do you need to pay attention to when making coffee by hand?

There are many factors affecting the taste of a cup of hand-brewed coffee, such as coffee beans, grinding degree, water temperature, ratio of powder to water, brewing method, extraction time and so on. As the source of coffee flavor, coffee beans account for the largest proportion, a bag of high-quality coffee beans can directly affect the taste of coffee in the final cup, so it is very important to choose good beans.

There are nearly half a hundred kinds of coffee beans on the Qianjie bean list, covering many large producing areas. You can choose according to your favorite flavor type. In order to ensure that everyone can have a better taste experience, Qianjie only delivers the coffee beans baked within 5 days, plus the transportation time, they are basically in the best taste stage when they are received.

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