Coffee common sense fine coffee bean grinding terminology

Tannic acid: after extraction, tannin will turn into a yellowish powder, which can easily blend into water. After boiling, it will decompose and produce pyrosylic acid, which will make the coffee taste worse. If the coffee is soaked and left for several hours, the color of the coffee will become stronger than when it was just soaked. And it is also less tasty, so there is the saying that "it is best to drink it as soon as possible."

Caffeine: caffeine is the most eye-catching of all the ingredients in coffee. It belongs to a kind of phytoxanthine (animal muscle component). It has the same properties as theophylline contained in cocoa, green tea contains the same theophylline, and the percentage of reduction after baking is very small. Caffeine has a very extensive effect. It will affect various parts of the human brain, heart, blood vessels, gastrointestinal tract, muscles and kidneys. The right amount of caffeine will stimulate the cerebral cortex, promote sensory judgment, memory and emotional activity, and make the myocardial machinery more active. Vasodilation enhances blood circulation and improves metabolic function. Caffeine can also reduce muscle fatigue and promote digestive juice secretion. In addition to this, because it also promotes the kidney function to help the body expel excess sodium ions (chemicals that hinder the metabolism of water molecules), caffeine will not accumulate in the body like other narcotic and excitant substances (narcotic drugs, paint solvents, stimulants, etc.) and will be excreted in about two hours. The biggest bitterness of ─ in coffee flavor is caused by caffeine.

Fat: the fat contained in coffee plays a very important role in flavor. It is found that there are many kinds of fat in coffee, the most important of which are acidic fat and volatile fat. Acidic fat means that there is acid in fat, and its strength varies with different types of coffee, and volatile fat is the main source of coffee aroma. Once the fat contained in roasted coffee beans comes into contact with the air, chemical changes may occur and the taste and flavor will become worse.

Protein: the main source of calorie is protein, and like dripping coffee, most of the protein will not dissolve out, so no matter how much coffee you drink, the nutrition you get is limited, which is why coffee will become a sacred food for dieters. The task of grinding roasted coffee beans into powder is called crushing.

The props used to grind coffee beans are called grinders.

It is said that Beethoven put sixty coffee beans into the grinder every morning, grind and then brew the coffee while grinding the coffee while enjoying its aroma. And then experience the fun excitedly. According to its size, the grinding methods of coffee beans can be divided into three types: rough grinding, medium grinding and fine grinding. Use the appropriate grinding method according to the coffee utensils. There is also medium fine grinding or very fine grinding (powdered coffee powder) which is finer than fine grinding. The timing of grinding coffee beans is before brewing coffee, only the need for grinding is the top grade. After the coffee bean is ground into powder, its surface area increases and absorbs moisture, which is easy to oxidize. In short, with the passage of time, coffee powder also plays a role of deterioration to damage the flavor. And after the ground coffee beans are placed, the carbon dioxide retained inside the beans will be lost together with the aroma. In this way, when the coffee powder is extracted and filtered, the coffee powder should be expanded without expansion, and you can't make delicious coffee anyway. The secret is to consider grinding and homework consistently, so brewing coffee is the most delicious and mellow. Fine grind

◎ fine grinding (fine particles, the same size as sugar) Medium grind

Grinding in ◎ (particles the same size as a mixture of granulated sugar and crude sugar) Regular grind

◎ 's knack for rough grinding coffee beans (coarse granules, the same size as coarse sugar)

The grinding prop for coffee beans is a grinder. There are numerous types of mills ranging from manual at home to large electric ones for business. Household grinders can also be used as decorations, and the number of people need more than one grinding, or electric to facilitate.

According to the structure of the grinder, there are grinders that use vertical and horizontal groove blades to cut coffee beans and those that grind coffee with molars. Each has its own advantages, and the situation of business use tends to mass production of the electric type as the mainstream.

However, the following two points should be paid most attention to when grinding coffee beans:

The friction heat of ① is suppressed to a minimum. (the aroma will fly away because of the fever)

Whether the size of ② particles is uniform or not. (if the particles are uneven, the concentration will be uneven.) taking this as a consideration, if you are a household mill, you should rotate gently and be careful not to produce friction heat as much as possible. Therefore, it is more appropriate to use electric grinders.

How to use the mill

Grind the beans before brewing.

There are two types of household mills: manual and electric. The manual type is used if the number is small, while the electric type is more convenient for the large number of people.

Determine the grinding method (particle size) with the bubbling apparatus.

Manual grinders should be careful not to produce friction heat only. And pay attention to whether it is mixed with other things. Whether the granules of ground coffee beans are large and neat or not should be checked. (in the case of uneven particles, it is possible that the function of the grinder is always, or coffee roasting is not symmetrical, etc.)

The grinding of coffee

In the Middle East, people still use mashing to beat beans into particles of different sizes, but when most people are gradually using bean grinders, Bella-Shavalin personally did an experiment on whether it is better to mash or grind. For public trust, and food watchers were invited to taste the two kinds of coffee at the same time. In the end, everyone thought that the mashed coffee powder was more fascinating than ground coffee. To grind satisfactory coffee powder, it is really very simple, as long as you try a few more times to find out your favorite flavor, in fact, there is no certain standard. But generally speaking, the aroma of coffee powder (powerdered) that is too finely ground is easy to run away and is more suitable for fresh grinding and drinking. The next level of coffee powder (very fine) is used when using an electric coffee maker, because the fine coffee powder brews more coffee, which is often used by the general company or restaurant side drinks. Then there is fine, which is about as thick as sugar, and dripping cooking is very suitable for this kind of thickness. Medium (medium), the amount of granular coffee powder in brewing is small, you have to put more coffee particles, so the coffee brewed is more fragrant, some coffee pots also use medium coffee powder, because too fine powder will fall into the sieve plate, but the water in the pot takes more than 10 minutes to brew a pot of coffee and the amount is small, it can be said to be the most uneconomical particles. There are many kinds of bean grinding machines, of which the most common is the household electric bean grinder, which can grind out particles of different sizes, small and light, and the price is not very expensive, so it is a good choice for families or people when there are few people. The manual bean grinder is the kind that looks antique and picturesque in a coffee shop, even if it is not used as a decoration, but the particles produced by this bean grinder are relatively large and slow. The professional electric bean grinder used in the coffee shop can grind out a variety of particles of different thickness. high speed and large quantity are the advantages of this kind of bean grinder. Many new Espresso coffee machines are equipped with bean grinding function, but the risk is that it may not be able to meet your requirements, how to choose, it all depends on the choice of consumers. Espreeso uses pneumatic brewing, the whole process only takes 20-25 seconds, in such a short time, whether the essence of coffee can be properly extracted, the size of the powder is extremely important. If the powder is too fine, the area of steam penetration becomes relatively larger, which will cause excessive extraction, concentrated but not fragrant. If the partner is too thick, the resistance is low, the coffee becomes thin, and the creme turns orange. Therefore, the purchase of bean grinder to have fine-tuning function is better. Cheap bean grinding mechanism image household multi-function mixer, the blade is in the shape of a windmill, and the ground beans are square in shape and unfavorable for extraction. Using a circular saw blade machine, the beans will be irregular and touch the water wide. although the unit price is high, it is still worth it.