Knowledge about coffee grinding

The ideal time to grind coffee is before cooking. Because the ground coffee is easy to oxidize and lose its flavor, especially when it is not properly stored, the coffee powder is easy to change flavor, and it is naturally impossible to cook mellow coffee.

Some people are afraid of trouble or don't want to buy more bean grinders. They usually buy ready-made coffee powder when drinking coffee at home. At this time, they should pay special attention to storage. If the climate is humid, it is best not to place coffee powder at room temperature after opening. A more appropriate way is to put it in a sealed jar and refrigerate it, and do not place it with garlic, fish and shrimp and other heavy-flavored food. Because the coffee powder is easy to absorb, a careless coffee becomes a strange taste coffee, then even the best quality coffee will be spoiled. However, some people put the cooked coffee powder in the refrigerator as a deodorant, which is a good way to make the best use of things.

When grinding beans, the size of the powder depends on the way it is cooked. Generally speaking, the shorter the cooking time, the finer the ground powder; the longer the cooking time, the thicker the ground powder. In terms of actual cooking, the ESPRESSO machine takes a very short time to make coffee, so the grinding is the finest, and the coffee powder is as fine as flour; it takes more than a minute to cook coffee by plugging the air, and the coffee powder is medium-sized grinding; American filter coffee takes a long time to make, so the coffee powder is the thickest.

Grinding coffee powder with the right thickness is very important for making a good cup of coffee, because the extraction of water-soluble substances in coffee powder has its ideal time, if the powder is very fine and cooked for a long time, resulting in excessive extraction, the coffee may be very bitter and lose its aroma. On the other hand, if the powder is coarse and cooked too fast, resulting in insufficient extraction, the coffee will be tasteless because it is too late to dissolve the water-soluble substance in the powder.

I. the principle of grinding

Generally speaking, a good grinding method should include the following four basic principles:

1. The degree of grinding suitable for brewing and cooking should be selected.

2. The temperature of cattle produced during grinding should be low.

3. The powder particles after grinding should be uniform.

4. Grind before cooking.

No matter what kind of grinder is used, it is bound to generate heat by friction in operation. Most of the fine substances are highly volatile, and the heat of grinding will increase the speed of volatilization, so that the aroma of coffee is lost in the air.

After the coffee bean is ground, the cell wall will completely disintegrate, the area of contact with air will increase a lot, the rate of oxidation and deterioration will become faster, and the coffee will lose its flavor within 30 seconds to 2 minutes. Therefore, it is recommended not to buy coffee powder, it is best to buy coffee beans, grinding before drinking, grinding should be brewed as soon as possible.

Before the invention of the bean grinder, people used stone pestles and bowls to grind coffee beans. A doctor abroad once experimented with this ancient tool and compared it with a modern bean grinder. It is said that the coffee powder made from pestles and stone bowls is the most mellow.

According to logical reasoning, the pestle cracked the coffee beans naturally by impact, which should not destroy the cell wall and retain the quality of the coffee. However, in modern life, it is almost impossible for people to use pestles and stone bowls to grind coffee beans, so it is particularly important to choose a good bean grinder.

Second, the method of grinding

According to the size of coffee beans, the grinding methods can be divided into rough grinding, medium grinding and fine grinding. Use the appropriate grinding method according to the coffee utensils. There is also medium fine grinding or finer and finer grinding than fine grinding (powdered coffee powder).

1. Fine grind: the particles are fine, the same size as sugar.

2. Medium grind: the particles are the same size as the mixture of granulated sugar and crude sugar.

3. Rental grinding (Regular grind): the particles are thick, as big as coarse sugar.

Third, the secret of grinding

1. The grinding tool for coffee beans is a bean grinder. There are three kinds of bean grinders:

(1) Manual rotary bean grinder for household use. It is suitable for leisure people with small demand, large particles and plenty of time.

(2) Electric bean grinder for household use. Can be ground into a variety of particle size coffee powder, can be ground out of 6 people at a time.

(3) Professional use of electric bean grinder. For commercial use, about a pound of coffee powder can be ground at a time.

2. The following two points should be paid most attention to when grinding coffee beans:

(1) reduce the heat of research. Grinding heat will cause the aroma of coffee to dissipate early.

(2) the particle size is uniform. Uneven particle size will lead to uncontrollable brewing time.

So if you use a family-style manual bean grinder, you should rotate gently so that it does not produce friction heat as much as possible. To sum up, if you consider the quality, quantity, time and convenience of grinding beans, the use of electric bean grinders for home use will be the best choice.