The knowledge of coffee, the varieties of black coffee and the method of brewing.

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Aroma is the life of coffee quality and best expresses coffee production process and roasting technology. The climate, variety, refining, harvest, storage, and proper roasting techniques in the country of consumption are all conditions that determine the aroma of coffee beans. Bitter is the basic taste of black coffee, there are differences in strength and texture, raw beans only contain very small amounts of bitter ingredients, followed by roasting caused by sugar, part of the starch, fiber caramelization and carbonization, only to produce the most symbolic bitter coffee. Black coffee also has a sour taste, and proper heat produces moderate sourness, which will make the coffee taste better and make people feel more deep. The sweetness of black coffee is related to bitterness, so the refreshing taste of black coffee must have sweetness.

Coffee beans are the raw material of black coffee. There are hundreds of kinds of coffee beans, which vary according to the variety, origin and grade, and the price also varies. At present, we are familiar with Blue Mountain, Italy, Mantenin, Brazil, charcoal and other types in Beijing. Many supermarkets can buy them, most of which are cooked beans after baking. Due to different origins, the characteristics of coffee beans are also different, some dark color, high degree of roasting, taste stronger; some lighter color, taste slightly lighter. Experts choose coffee, mostly grab a handful of coffee beans, see whether the color of each bean is consistent, particle size, shape is similar, so as not to buy inferior products disguised as mixed beans. In addition, if the baked beans out of oil, it means that it has deteriorated, not only reduce the degree of alcohol, but also will appear astringent and sour taste.

People who like black coffee usually make it at home. On the small square table, place a few essentials, the process is like the Chinese tea ceremony. Those who pay attention to sentiment will buy a bean grinder and grind it slowly at home to enjoy the process of devotion. At present, the better bean grinder is mostly produced in Japan, China Taiwan, there are manual, there are electric, manual bean grinder is mostly antique, the price is one or two hundred yuan. But there are also more expensive ones, such as the fashionable products that can adjust the thickness of coffee powder through springs or adopt the most popular two-wheel appearance, ranging from 300 yuan to 600 yuan.

There are three ways to make black coffee, so there are three different types of coffee pots: traditional follicular, siphon, and electric. The traditional follicular type is the most primitive and simplest tool. The coffee pot consists of a funnel, a filter paper and a container below, but it requires a high level of artificial craftsmanship. If you grasp it properly, you can cook the best coffee that tastes mellow. The price of this pot is very cheap, you can buy it for ten yuan. Follicle coffee pot suitable for stable feel, taste sharp coffee family. When choosing a follicular coffee appliance, pay attention to whether it is three holes or one hole, which is very important. Three holes drip faster, extraction time is short, coffee is lighter, one hole is the opposite.

Although the traditional follicular type is the simplest, it is the original coffee pot that can best brew coffee; in the production process, it is necessary to accurately grasp the water temperature, water flow size and trajectory. Uniform water flow and circular trajectory can make coffee taste natural, so, the choice of kettle and hands when pouring water control is very important, water flow contact with coffee, should try to keep circular, from outside to inside, from inside to outside cycle, so that coffee and water flow full contact; At the same time, 92 degrees Celsius water temperature can make coffee fragrance, alcohol, sweet, acid, bitter uniform and strong, too high water temperature will scald coffee, so that the taste becomes sour, astringent; Low is difficult to brew coffee fragrance.