What do you need to pay attention to when making coffee by hand? What is the relationship between grinding degree, water temperature and time?

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What do you need to pay attention to when making coffee by hand? What is the relationship between grinding degree, water temperature and time? How do you flush it by hand?

Uniformity of grinding

In an ideal grinding, it is best to grind each coffee particle of the same size and shape, so that the uniformity can be best when brewing. But in fact, no matter what kind of grinder you use, you can't do this. No matter how high-end the grinder is, the coffee powder will inevitably contain a little thicker particles and too fine powder, in which the coarse particles are relatively easy to flash, and the dust is absolutely difficult to avoid. If the amount of these too coarse or too fine particles is small, the problem is not serious, and if there is more, there will be a phenomenon of "some particles are not fully extracted, but there is already some excessive dust extraction" [Note 1]. So it is very important to make the coffee particles as big as possible. But to do this, there are probably only two feasible ways, one is to buy a relatively high-end grinding machine to improve grinding uniformity, and the other is to purchase a powder sieve as an auxiliary. I am more in favor of the first of these two methods, because it takes an extra expense to buy a powder sieve, and the aroma of fresh coffee is more or less sacrificed in the process of sieving, while buying a high-end grinder, but only once the heartache (and may have to hide the true price to the other half).

Finally, the temperature of the water during brewing

With regard to the temperature of the water, we need to make some supplementary remarks.

How to control the temperature range from 92to 96? The principles are roughly as follows: if the water temperature is on the high side, the extraction rate will increase, regardless of the sour taste, bitterness, astringency and concentration; if the water temperature is low, the extraction rate will decrease, but in terms of ratio, the bitterness and astringency will decrease more, and the sour taste is easier to highlight.

Although 92-96 degrees is accepted by most people, eating is a very personal behavior. If you think that 85-90 degrees is your favorite temperature, you don't have to listen to what others say and do it the way you like it. However, I suggest that occasionally try hot water around 93 degrees for hand flushing, which may change your point of view.

As mentioned earlier, grinding and water temperature account for 80 out of 100 points for hand-brewed coffee, compared with 20 points for brewing, which is a bit like a side effect.