As a result, various components contained in coffee are difficult to be extracted in ice water, so the method of fine grinding and slow extraction must be adopted. The specific method is to soak coffee powder in ice water for a long time, and extract it at a very slow drop speed. The general standard speed is 1 drop per second, 45-50 drops per minute, and it usually takes about 8- 12 hours.
Although it takes a long time to wait, its biggest advantage is that the tannic acid we hate most will hardly decompose in low-temperature ice water. Although caffeine will decompose in a small amount in ice water, it is reduced by about 90% compared with hot water extraction. Because there is no astringency in iced coffee, there is little bitterness, so iced coffee is particularly pure in taste.
Coffee introduction
It is a drink made from roasted and ground coffee beans. As one of the three major drinks in the world, it is the main drink popular in the world together with cocoa and tea. Coffee tree is a perennial evergreen shrub or small tree belonging to Rubiaceae. Coffee for daily drinking is made from coffee beans and various cooking utensils.
Coffee beans refer to the nuts in the fruit of the coffee tree, which are baked in an appropriate way. A cup of standard coffee should not taste bitter. A qualified barista will perform every step carefully when making coffee, and finally the coffee presented to the guests will show different degrees of sweetness, acidity, mellow degree or cleanliness in taste.