Introduction to the preparation method of grinding degree and proportional time of cold-extracted coffee the difference between ice-drop cold-extracted cold-brewed coffee

Recently, many friends asked about cold coffee, so Qianjie took this opportunity to talk about "cold coffee".

Cold coffee is actually different from the usual hot water brewing coffee. It is the coffee liquid extracted by soaking or dripping coffee powder in cold water for a long time. Cold bubbles and ice droplets are the most common forms of cold extracted coffee. But now there are also places where cold-extracted coffee is narrowly defined as cold-brewed coffee, which is distinguished from iced coffee. This may come from the problem of translation. Cold coffee is "Cold Brew Coffee" in English and ice drop coffee is "Cold Drip Coffee" or "Dutch Coffee" in English.

In the usual time of brewing coffee, we will pay attention to the water temperature, because the temperature of the water will directly affect the extraction efficiency of coffee, the extraction efficiency of cold water is very low, if you want to get a cup of coffee with a good concentration, you must extend the extraction time. Therefore, cold-extracted coffee takes a very long time to make, usually in 6-8 hours. The biggest difference between cold-extracted coffee and hot coffee is that cold-extracted coffee takes a long time to extract, so there will be more water-soluble flavor substances, stronger flavor and more mellow taste. And the whole process of low-temperature extraction and preservation, the shelf life will be longer, generally can be stored for 3-5 days.

As for cold-extracted coffee, what kind of beans should be used? Qianjie recommends the use of medium and shallow roasted coffee beans, the cold extracted coffee will be refreshing and delicious, very suitable for summer drinking. Some friends may want to know whether a certain type of coffee is suitable for cold extraction coffee, or want Qianjie to recommend several coffee beans to make ice drop coffee. In this regard, Qianjie can help you sort out the relationship between coffee bean flavor and cold coffee, so that you should know more clearly what kind of coffee beans you want. The flavor description on the coffee bean label is the flavor tasted during the cup test, that is, regardless of the extraction method, the coffee produced will have the flavor described on the label. Cold-extracted coffee is a kind of practice, which can highlight some characteristics, such as strong fermented flavor.

Therefore, whether it is used to make hand-brewed coffee or cold-extracted coffee, you can select the individual coffee beans that match the flavor description on the label according to your own taste, and the flavor of the coffee beans does not conflict with the cold extraction method. "if you like the obvious sour and refreshing feeling, you can choose some light-roasted coffee beans that are washed in water, such as Yejassefi, Guatemala Flower God, Kenya; if you like sweet fruit honey, you can choose light-baked coffee beans that are sun-cured and anaerobic, such as Sakuran, Stonehenge Manor blueberries, Rose Valley. If you like the strong flavor of fermentation and wine, you can choose Shirley of Honduras, Litchi Orchid, Baja of Costa Rica, Mozart, Flower and Moon Night of Colombia. " Is it true that medium and deep-roasted coffee can't be made into cold coffee? No, it's just that most people can't accept iced bitter coffee, just as no one will volunteer to drink ice-cold tea, so it is naturally not recommended. Qianjie also tasted a cold extracted coffee made from moderately roasted Yunnan beans, which was properly preserved and refrigerated until the seventh day, with a mellow taste and a strong wine-like fermented feeling. It shows that unsour coffee is not impossible to make cold extract, but it is very difficult to make good cold extract.

The production method of cold extraction coffee is also relatively simple, basically master a few key parameters to make a good iced coffee. Cold extraction is divided into cold soak coffee and drip extraction ice drop coffee. The production method of ice drop coffee has also been explained in detail before. Interested friends can click "here", so I won't repeat it in this article. The utensils for making cold coffee are also very simple. All you need is a 600ml container. "can you ask if a mineral water bottle is OK?" "of course, as long as you don't dislike its indecency!" The main parameters of cold brewing coffee are coffee grinding degree, proportion and time. The degree of grinding required for cold brewing coffee is finer than that for hand brewing, which is about 85% of the pass rate of sieve 20.

The powder-to-water ratio is usually 1:12, and you can adjust it according to your own preferences. In terms of 600ml containers, about 40 grams of powder requires cold water from 480ml. It is recommended to control the soaking time between 12 and 24 hours. The longer the time, the stronger the coffee. Just put the coffee powder and water in the bottle and shake it gently to make the coffee powder wet. Then put it in the refrigerator (5-10 degrees) and refrigerate for 12-24 hours.

Finally, you need to filter, use filter paper (cloth) to separate the coffee grounds from the coffee liquid, you can also put it in the refrigerator and refrigerate for 4 hours before drinking, the aroma will be better.