Can the metal filter of hand-brewed coffee replace the filter paper for brewing?

In yesterday's article, Qianjie mentioned the material of filter paper and suddenly remembered that in the filtering tools, in addition to paper, cloth and other soft materials, there is also such a completely different filtering tool-"metal filter"!

The coffee made from the filter paper made from log pulp has a very clean experience, while the coffee made from the filter cloth made of flannel has a high alcohol thickness, so! What kind of characteristics does a filter made of metal make coffee look like? So Qianjie pulled out the metal filter which was used as a tea filter, which was bought by a shop with high sales at random on a treasure in Qianjie last year. Conical in appearance, it is a flat-bottomed filter cup.

Its structure is mainly divided into two layers: the external network and the internal network, which is a 400-mesh metal filter, and the function of the external network is mainly used as a fixed filter shape! The structure is very simple, so next, Qianjie will compare it with the filter paper to see how the coffee it brews is different.

In the brewing experiment, beans: Santavini, Ethiopia use g weight: 15g grinding scale: Ek43 9.5scale, powder to water ratio: 1:15 boiling water temperature: 92 °C water injection method: three-stage type before brewing, the street first pours the coffee powder into the filter and shakes, the aim is to observe whether coffee powder will fall out of these slits in the 400-mesh mesh that is visible! So, put the cup under the filter screen, cover the filter net, and directly take out the lifelong learning in front of the street. Shake it!

(this skilled operation, it is difficult not to doubt.) remove the filter, there are no coffee particles at the bottom of the cup, which is enough to show that the size of 400 mesh is enough for conventional grinding! As it happens, the hot water has reached the specified temperature, so let's start cooking. Qianjie uses the same way as usual to test the filter, still steaming with twice the amount of water (30ml) of powder, slowly injecting the second section of 120ml hot water around the big circle after the end of steaming, and then slowly injecting the remaining 75ml hot water around the small circle when the water level is about to bottom. after the water droplets are filtered, you can remove the filter cup and finish the cooking!

The total cooking time with a metal filter is 2 minutes 09 seconds, which is not much different from that of 2 minutes 05 seconds of filter paper. In terms of flavor performance, Santa Vini washed out with filter paper has a full tropical fruit flavor, such as pineapple, citrus and other bright acidity, the aftertaste has a little red wine fermentation, cold down with mango, carambola sweet and sour feeling! Delicious! On the contrary, from the permeability of the liquid, we can see that the cleanliness of the Santavini is relatively low, which is really the case when drinking.

Second, there is a thin layer of oil floating on its surface, which means that it is like flannel. Because of the large gap, the oil can pass through and then be added to the coffee liquid. However, Qianjie did not feel too much grease on the taste, because, in terms of overall flavor performance, this cup of coffee is somewhat "unsatisfactory". Except for a little citrus sour taste, the whole cup of coffee is full of negative flavor of insufficient extraction! We can find the cause of this problem directly in the brewing stage: because the circle is too big, and the impact of the water is high, a large amount of hot water does not extract the coffee substance, but runs directly through the filter cup and drips to the next pot, resulting in a serious lack of extraction!

So we can know that it is not feasible to measure the metal filter by the conventional method. Therefore, we need to change the strategy to reduce the hot water running through the filter cup in order to give the coffee a qualified extraction rate. As a result, Qianjie changed the way of water injection, changed the original action of water injection around a large circle to a small circle of water injection around the center, and reduced the height of water injection to reduce the impact of water flow. This time, in the cooking process, the hot water directly through the filter is much less, with a total time of 2 minutes and 10 seconds.

Sure enough, the overall taste is much better, the taste is full and smooth, and the flavors of pineapple and citrus are well reflected. Although there is still a little bitterness in the latter part, it is much better than the previous pot. Therefore, when we use the metal filter, in addition to changing the conventional way of water injection, we also need to master certain water control skills in order to use it to make coffee with the right taste. And the characteristics. Wait until the front street to observe.

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Front Street Cafe

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