1
How to grind coffee beans without a grinder
The freshness of coffee beans determines the success of this cup of coffee by 80%. Some people can drink instant coffee for convenience; some people can make coffee with coffee powder when they are improved; next, I will tell you how to grind coffee beans without a grinder.
Grind
Two rotating parts are used to squeeze and crush coffee beans. The abrasive part may be disc-shaped or conical. The noise of the cone-type machine should be lower, and the probability of blockage should be lower. The ground coffee produced by the grinding method is more uniform, and the taste is more consistent when brewing. The slower the grinding speed, the less heat generated by friction, so the aroma of coffee is not easy to lose.
Polished
Use a high-speed machine at 20,000 to 30,000 revolutions per minute to chop the coffee beans into fines (some people simply use a beater). This type of blade grinder has a longer life of consumable parts; however, the heat accumulates during the grinding and the size of the coffee powder is uneven, making it difficult to produce high-quality drinks. This type of grinder can only be used in drip coffee pots in theory.
Resume
If you can't find good grinding equipment, all you can do is to use a pestle and a mortar, just like a Chinese medicine smashed medicinal materials. As for the quality of coffee beans, it depends on time and strength.
2
Grinding skills of coffee beans
Grinding degree
Fine grind fine grinding (fine grain, the size of sugar)
Grind in Mediumgrind (the granules are the same size as a mixture of granulated sugar and coarse white sugar)
Regular grind coarse grinding (coarse particles, the same size as coarse white sugar)
How to use the mill
Grind the beans before brewing the coffee, and determine the grinding method according to the required particle size. Hand-operated grinders should be careful not to generate frictional heat alone, and be careful about whether they are adulterated with other things. Check whether the grains of the ground coffee beans are large and tidy.
Precautions for grinding coffee beans
The frictional heat is suppressed to a minimum. (Aromatic ingredients will be scattered due to heat)
Whether the particle size is uniform or not. (If the particles are not uniform, the concentration of the brew will be uneven)
Taking this into consideration, if it is a household grinder, it should be rotated gently if it is a manual type, and pay attention to avoiding frictional heat as much as possible, so it is more appropriate to use an electric grinder.
principle
The timing of coffee beans grinding is before brewing coffee. After the coffee beans are ground into a powder, the surface area of the coffee beans increases to absorb moisture and is easily oxidized. In short, as time goes by, the coffee powder also plays a deteriorating effect and damages the flavor. After the ground coffee beans are placed, the carbon dioxide retained in the beans and the aroma will be lost together. In this way, the coffee powder should expand and not expand when it is drawn out and filtered, and no delicious coffee can be brewed no matter what.
3
How to use grinder extract
Evenness
Coarse coffee particles are more likely to be under-extracted, while finer particles will be over-extracted in advance. Therefore, the larger the thickness of the ground coffee powder, the more turbid and irritating flavors will be tasted. When the coffee powder with the same grinding particle size and relatively similar shape is used for extraction, the taste becomes brighter and stronger, and the performance of the flavor characteristics is clearer and more consistent.
Fine powder
Coffee powder that is close to flour will easily be over-extracted and even dissolve in water, which will affect the taste of coffee extraction. The more fine powder, the more easily the coffee is over-extracted, and the bitter and more mixed the taste. When making espresso, the fine powder will be flushed out into the cup by the water stream. If extracted properly, the dense oil will hold up the fine powder, and the fine powder will float on the surface of the oil, forming a beautiful "tiger". But "tabby" does not represent the taste of espresso. You can reduce the production of fine powder by choosing a better-performing grinder or using a screen. But if there is no fine powder at all, the brewed coffee will also lack layering.
Calorific value
The grinding disc of any grinder will generate heat during the grinding process, and the heating of the coffee powder will accelerate the oxidation process, accelerate the volatilization of the aroma, and cause the flavor of the brewed coffee to weaken. The calorific value of the cutter head depends on many factors such as the size of the disc, the material used, the structure of the knife, the fineness of the grinding powder, the motor speed, the hardness, and texture of the coffee beans, and so on.
Static electricity
Generally speaking, the finer the grinding and the faster the grinding, the stronger the static electricity generated; the internal material is plastic, and the lower powder port does not use a grinder designed to reduce static electricity, and the static electricity generated is stronger; it is rich in grease, Coffee beans with a deeper roasting degree are ground, and the static electricity generated is stronger. When the espresso grinder is grinding, the fine powder tends to form agglomerates, which affects the density of the powder and causes uneven extraction; while the iron magnet at the outlet of the single-product grinder is electrostatically adsorbed on the silver skin and Fine powder to help reduce over-extracted flavors and off-flavors.
4
The good and bad of making coffee with a hand grinder
1. The hand grinder is good:
It has a beautiful appearance and is mostly made of wood, glass, and a part of iron. It is a good choice whether it is used to grind coffee beans or placed at home.
The price is cheap, usually tens of dollars, which is a price that most friends can accept.
The grinding degree can be adjusted, and the nut in the middle of the hand grinder can be adjusted to adjust the thickness of different coffee powders. This is a very practical function for friends who have several different coffee-making appliances at home.
It is not easy to produce a fine powder. If there is more fine powder in the coffee powder, the taste of the coffee will not be uniform. It is like you are frying a dish. It's still raw.
Second, the damage of the hand grinder:
Because of the characteristics of the grinding disc, it is easy to grind unevenly.
It is easier to generate a lot of heat, which aggravates the loss of coffee aroma, which also causes the coffee's gas to be easily emitted when the hand grinder is grinding.
The efficiency is too low. Believe it or not, the China Coffee Network believes it anyway. This is the biggest problem for China Coffee Network. If I want to make a cup of coffee, if I use 20 grams of coffee beans to grind, the grinding time can be For up to 5 minutes, your hands will become sore when you shake them. Of course, if you regard this as a way to exercise your body, then a hand grinder is quite suitable for you.
The wooden base is easy to break. The grinding disc on the hand grinder is fixed on the wooden base with screws. After a long time of use, the screw holes will become larger and larger, which makes the grinder unable to use. The solution is to Remove the grinding part of the hand grinder, and then change the place and screw the screw to the base.
