[cooking system explanation] how to determine whether a coffee bean is suitable for soaking or filtering?

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Even if the same kind of coffee beans are selected, the basic principles of extraction will be different due to different kinds of extraction utensils, which will make the final coffee flavor different. therefore, the coffee brewed with different utensils can obviously feel different flavor and taste experience. Generally speaking, the extraction methods of coffee can be divided into two categories: filtration extraction and immersion extraction. So, can you tell the difference between filtration and soaking? Let the editor tell you today!

The two most commonly used brewing methods in the store are hand brewing and siphon (espresso put aside. ), which happen to be the representatives of filter extraction and immersion extraction. So, if you have a bean, how do you know if it's suitable for hand flushing or siphon?

The following is to share with you the editor's thoughts and understanding of these two brewing methods: in the process of extracting coffee, we can imagine that the flavor in the coffee is constantly released, and the difference between soaking and filtration mainly lies in the speed of flavor release.

In the filtration extraction system, because we will continue to inject fresh hot water and the coffee liquid will continue to flow away below, so a low liquid concentration can be maintained in the extraction system, thus accelerating the high concentration of flavor in the coffee powder to dissolve and spread into the water, and the extraction speed will be faster. For example, hand-brewed coffee, American machine drip coffee, iced coffee and so on.

Soak extraction as the name implies, coffee powder soaked in hot water, after proper extraction can be enjoyed. In the immersion extraction system, we use the same hot water to extract coffee all the time, but because the coffee powder is not evenly distributed in the water, the coffee concentration in the water will continue to increase, resulting in a small difference in the concentration of flavor between the coffee powder and the water. The diffusion rate of extraction is gradually slow (so immersion extraction is relatively not easy to cause over-extraction). This can actually be understood by a simple formula for solid dissociation (related to diffusion). The methods of immersion extraction include: pressure pot, siphon pot, smart cup, cup test and so on.

Jonathan, a doctoral student abroad, analyzed the dissolution concentration of coffee flavor by immersion extraction and filtration extraction by using analysis software, namely, the following figure:

It can be found that if soaking extraction is used, the coffee flavor is quite uniform and complete, while filtration extraction can highlight or over-extract some special aromas.

Summary:

In the system of fast diffusion and extraction, if the coffee contains a special flavor and belongs to small molecules and can be extracted quickly, the flavor will be released continuously, because it will be extracted continuously, so the concentration will be relatively high. finally, when we drink, we can feel this flavor very strongly. So the editor will like to use filter extraction to brew coffee beans with obvious ① flavor, and coffee with complex but balanced ② flavor and high Body.

On the other hand, in the immersion extraction system, because we extract coffee by the concentration difference of diffusion (excluding the effect of stirring), as long as the time is long enough, it is the best way to drink coffee with a complete appearance. Editors like to use soaking and extraction methods in: ① deep-roasted coffee beans to improve the overall balance and sweetness; ② complex flavor but the use of filtration extraction will make a certain type of flavor too strong, resulting in unbalanced coffee beans.

So if some coffee beans have the special flavor you want to emphasize, you might as well try the filtration extraction system, but if you end up brewing a cup of coffee with unbalanced flavor and sweet and sour feelings, you can try soaking and extracting. Perhaps slightly reduce some of the special flavor, you can drink coffee more comprehensive flavor.

The above is the content of this sharing. I hope this sharing will be helpful to all of you. What kind of cooking system do you like?

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