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Hand brewed coffee is not enough to extract, can you pour it back and re-extract it? The four parameters of a good hand rush!

Published: 2026-08-26 Author:

Last Updated: 2026/08/26, Hand-made coffee has been integrated into most people's daily life, whether in a leisurely home, or in the office of work, as long as there is free, coffee on the top of the person high and low on a pot. But often, high-frequency brewing always avoid occasional rollover, too thick or too light are the common "old"rollover events

Hand-brewed coffee has been integrated into the daily life of most people, whether in a leisurely home or in an office where they are at work. As long as they have free time, the people on top of the coffee will have to fill a pot. But often, high-frequency cooking can not avoid occasional rollover, too thick or too light are common "old friends" of rollover events. It's hard to drink, but it's a pity to abandon it. When we don't want to waste it and don't want to drink it, we have to think of other ways to improve it. Excessive extraction or high concentration is easy to solve, as long as the coffee is diluted by By pass (that is, adding water), the coffee can be easily tasted. But if the concentration is too low / not enough extraction of coffee, then it is a bit difficult. We can't pour it into the pot and "heat up the juice", can we?

Then I saw a comment on the front street where I was surfing: can I rewind it, soak it again and extract it again? If you think about it, it seems that you can really try it. So today, Qianjie will come to the whole job to verify whether it is really feasible to extract again.

Why can I try it? What is the principle of doing this? Before you do this, let's talk about why I think it's worth a try. To get a good cup of coffee, we need to extract the sweet, sour and bitter flavor substances hidden in the coffee with hot water (bitter substances, but not much). This step is inseparable from the appropriate four extraction parameters: water temperature, grinding, ratio and time.

These four parameters are more important to novice friends than technique and water quality. Each item is responsible for the corresponding extraction efficiency and complements each other. When one of them has a deviation and can not meet the demand of extraction, it will lead to changes in the taste of coffee and insufficient extraction. Insufficient extraction means that the flavor substances in the coffee are not fully extracted, so the concentration is low and the taste is light. In other words, many of the flavor substances in the coffee powder bed have not been extracted. Therefore, if we pour back this "what's wrong" coffee liquid and bring out the flavor substances that are still hidden in the coffee, won't this cup of coffee taste good?

But before the experiment, what we need to know is that after brewing, the original hot water at 90 °C has been turned into coffee liquid at about 70 °C, and its extraction efficiency is not so high, so friends do not have to worry too much about the occurrence of extraction. the probability is extremely small.

The necessary props for the extraction experiment are naturally a pot of coffee with insufficient extraction. Such props simply should not be easily satisfied. Qianjie, the bean used in this experiment is Asaria of Kenya. We only need to reduce its extraction efficiency to get a pot of underextracted coffee. Through roughing and grinding, we get a pot of 70 °C coffee with a concentration of 1.16%. The extraction is relatively insufficient and basically does not show any positive flavor, which can be said to be a cup of coffee-flavored water.

So we pour 1 100ml of the total liquid volume into the powder bed, re-extract, and then fuse the rebrewed coffee with the remaining coffee liquid, and finally pass the tasting to determine whether it is qualified or not, and then extract!

It took 30 seconds for the coffee to be re-extracted, and when it was added to the remaining coffee liquid, we re-measured it and found that the concentration increased from 1.16% to 1.22%. The taste is much fuller than before, and the taste of tea and berries begins to emerge! It has a good entrance at this time, but Qianjie is greedy, so it goes back again (it is still 1 hand 2).

Then the concentration rose to 1.25%, the sweetness of caramel, the taste of Wumei and small tomatoes is already quite obvious! This is more in line with the taste buds in front of the street, and that's it. So we can know that this method is feasible. However, after a long period of inversion, the flavor of coffee continues to be lost during this period, and its flavor performance will be weaker. Therefore, when we are able to brew the coffee, we try to make the coffee as good as possible, until after a car rollover occurs, we have to adjust the taste later. After all, it will increase the things to be done, and the taste is not so good, so it is better to do it well in the first place and reduce trivialities! Right?

(later stage of the camera: yes! )

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Front Street Cafe

No. 10 Baoqian street, Yandun road, Dongshankou, Yuexiu district, Guangzhou, Guangdong province

FrontStreet Coffee is a long-established specialty coffee roaster in Guangzhou China, selling freshly roasted beans from its own farm in Yunnan as well as dozens of carefully selected single-origin beans from around the world for both pour-over and espresso. The products deliver consistently excellent quality and great value, with shipping within 24 hours. Guangzhou’s FrontStreet Coffee shop is recommended by many coffee lovers, and the beans are now available online at the Tmall 。