The grinding process of coffee beans
The grinding process should also match the cooking method, which is the key to extracting the best flavor from coffee beans. The cooking method of coffee powder which is in contact with hot water for a long time requires thicker particles. If the coffee powder is too fine relative to the cooking method, the coffee will be too bitter, hard and "overcooked". At the other extreme, of course, the coffee powder is too thick to make the finished product tasteless.
Because of the large contact area between the powder and the air, the ground coffee powder is easy to oxidize and degrade. With the improvement of people's taste in drinking coffee, more and more people tend to grind coffee beans at home and cook them now. Now there are many household appliances specially used to grind coffee.
There are three kinds of grinding methods for coffee beans: "grinding", "grinding" and "mortar grinding".
"Grinding" uses two rotating parts to squeeze and crush coffee beans. The grinding parts can be disc-shaped or conical. Conical machines are less noisy.
There is also less chance of blockage. The coffee powder produced by the grinding method is more uniform and the taste is more consistent when cooking. The design of the conical grinding disc reduces the required speed, which is generally less than 500 revolutions per minute. The slower the grinding speed, the less heat generated by friction, so the aroma of coffee is not easy to lose. By adjusting the grinding parameters, the cone grinder can be used for the preparation of different kinds of coffee. A better machine can grind the ultra-fine powder needed for Turkish coffee. Disc grinders generally have higher rotational speed and generate more heat, but they have a wide range of functions, economical and practical, and are suitable for the preparation of most household coffee.
"polishing": most modern machines actually cut coffee beans into pieces at a speed of 20, 000 to 30, 000 revolutions per minute (some people simply use beaters). The consumption of this kind of blade grinder is longer, but the accumulated heat in the grinding and the uneven size of the coffee chips make it difficult to produce high-quality drinks. In theory, this kind of grinder can only be used for drip coffee pots. The dust they produce can clog the filters in Espresso and French press machines.
"mortar mill": if you can't find good grinding equipment, all you can do is to use a pestle and a mortar to slowly enjoy the fun of labor.
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Problems that should be paid attention to when tasting coffee
(1) No milk is the most widely used coffee condiment. Traditionally, milk has never been added to coffee in some countries such as Yemen, Ethiopia and Turkey. It is widely believed that milk was first added to coffee by Monin in Grenoble in 1685. In the mid-1980s, 57% of people in the United States drank coffee with milk, while Germany had a high percentage.
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Processing technology of coffee-coffee beans
Peeling: the peel and most of the flesh are removed mechanically. Roasted coffee beans are fermented and dried: coffee beans can release the special aroma of coffee through roasting. Each coffee bean contains its aroma, sour taste, sweetness and bitterness. How to release it incisively and vividly depends on the heat of its baking, from the insipid raw beans to the mellow aftertaste in the cup.
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