Six ways of coffee extraction _ how to extract coffee by hand _ details of espresso extraction

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Today, the editor introduces three things that are very important for brewing coffee.

1. Six ways of coffee extraction

2. How to extract hand-held coffee

3. Details of espresso extraction

Extraction plays the most important role in brewing a cup of coffee, whether it is hand-dripping filtration, Espresso Italian concentration, or any other way of cooking has a lot to do with extraction. Extraction is the key to brewing a cup of coffee, and it is divided into several aspects.

Six ideal extraction methods

Depending on the use of the equipment, each coffee device has a different extraction mode:

Soaking method:

French filter pressure, Turkish coffee is to soak the coffee in hot water, and finally separate the coffee grounds to get a stronger coffee. Iced coffee belongs to iced coffee, which can be used to remove miscellaneous powder before drinking.

Cooking method:

Just like in many films, foreigners put pot-shaped coffee pots down in the morning to make coffee, using slow heating on the stove and convection extraction in water to extract coffee, which is mostly used in American coffee.

Infiltration mode:

The representative example is the mocha pot, where hot water is added to the furnace and heated to extract coffee from the boiling water to the upper pot, and the coffee is obtained by means of heat penetration.

Hand drip filter:

Hand-held coffee uses hot water to pour into the coffee, the taste of the ground coffee powder is extracted into the water, and then gravity is used to make the coffee flow from top to bottom to complete the extraction. In addition, ice droplets also belong to this way of low filtration.

Vacuum filtration:

Siphon Syphon is the use of vacuum filtration, Syphon uses the siphon principle to absorb the hot water from the lower pot to the upper pot for coffee extraction, after pinching the extraction process, the heat source of the lower pot will flow back to the next pot.

Pressurization mode:

Obvious examples are Espresso Italian concentrate and Aeropress Philharmonic pressure. The former uses high pressure, high temperature and nine atmospheric pressures to brew coffee to get concentrated coffee, while the latter first uses stirring and extraction in hot water, and finally completes the extraction of coffee by unarmed pressure.

Each method has its own characteristics, and no particular one is superior to the others. With the right cooking, choosing the right coffee beans and the right degree of grinding, you will be able to extract the good coffee you want to drink. Here are the more common hand cups and Italian style.

Extraction of Coffee from hand Coffee

Many of the changes in the extraction of hand-held coffee can be controlled by ourselves, and because there are so many factors that enable us to adjust a variety of tastes, it may be too sour or bitter in the mouth of others, but it is extremely delicious in your mouth. Then you don't have to succumb to the way others cook your favorite coffee.

The process of extraction

Grind the coffee beans into powder to increase the contact area between coffee and hot water.

There are many chemical reactions in the process of roasting coffee beans, such as Mena reaction, these processes will make coffee beans produce scorched aroma and many aroma factors that this coffee should have become more mature. the degree of roasting will also determine the sour, sweet, bitter and thickness of coffee beans. Coffee beans with more fruity aroma usually use shallow roasting treatment, and the deeper the roasting degree is, the bitterness will increase. How to balance the sour, sweet and bitter of a coffee bean depends on the skill of the baker. After roasting, the coffee beans will have many small holes, if you do not make good use of the one-way valve hole packaging at this time, it will lead to the loss of coffee aroma factors, grinding before drinking is the best choice.

Dissolve coffee aroma factors in water by dissolution and diffusion

When brewing coffee, the taste of coffee will be extracted through the two principles of dissolution and diffusion. after the flow of hot water, the hole in the crushed coffee bean cell will squeeze the gas out of the cell, creating a visual effect that will expand when the hot water is boiled down at the beginning. The hot water entering the coffee cell will dissolve the taste of the coffee, resulting in a higher concentration of concentrated liquid, which is resting for a period of time to make the dissolving degree higher. After the water injection is to use the diffusion effect, the higher concentration of coffee extract will turn the hot water into the same concentration of liquid, this action is also called steaming.

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Remove the coffee grounds that have been boiled

The use of too fine or too coarse grinding degree may change the extraction process, if it is too coarse, the effect of dissolving will be too low, so that the coffee taste is not enough; on the contrary, too fine will release the bitterness to the excessive. Extraction time can also have an impact, but everyone drinks coffee differently, and it's right to keep trying to find your favorite grinding degree.

Extraction of Espresso Italian concentration

There are several elements needed to extract a nice, tasty Espresso:

Extraction pressure is about 9. Atmospheric pressure

The amount of extraction is 25ml / 30c.c.

The extraction time is 20ml / 30s.

The extraction temperature is 85 ℃ and 92 ℃.

This is a simple condition, but there are many other factors, such as the parameters of the coffee machine, coffee grindability, water quality or environmental humidity can change the taste of a cup of Espresso.

Selection of bean grinder

Espresso bean grinder requirements are higher, because high temperature, high pressure and rapid extraction requires a fine degree of grinding coffee powder, too rough grinding will be due to the touch area is too small and the coffee flavor is insufficient, in many competitions are the use of Mazzer brand bean grinder, in the previous bean grinder recommendation can also see those more suitable for Espresso grinding.

Selection of Italian coffee maker

Italian coffee machine is recommended to use semi-automatic coffee machine, the difference between semi-automatic and full-automatic lies in the difference between grinding beans, there are special articles to introduce the reasons will not repeat. Coffee machines are usually expensive, such as the Victoria Arduino Black Eagle specified in the Taiwan barista contest, an Italian brand founded in 1905, dedicated to making better espresso, and a common designated machine in all big competitions.

Details of espresso: more attention should be paid to the details

Crema

Crema, also known as Klinma, refers to an oil-like layer of coffee extract that wraps oxygen, carbon dioxide and emulsified oil on an Italian concentrate. Many people regard this as a sign of whether a cup of espresso is fresh, and Lahwa also uses this layer of oil to support milk and milk bubbles.

Gold extraction

It shows that a cup of Italian concentrated coffee powder should be produced at 60 c. C. In 22 Mel 27 seconds with 20 grams of coffee powder. Espresso.

Over extraction / over extraction

It may be because the water temperature is too high or the extraction time is too long, resulting in irritating bitter and sour taste, and coffee oil layer Crema is also slightly insufficient or even blackened.

Pre-immersion

Before the extraction process, some water will be released to soak the coffee powder in advance, which will help the later extraction process, making Crema more beautiful and palatable as a whole.

Conclusion

Each cooking method has its own advantages and disadvantages. In fact, you don't have to adhere to any iron rules. Many of them are products of rules of thumb. Maybe you accidentally hit the cooking method to achieve a delicious taste that you have never had. Delicious has always been a very subjective feeling. Just like stinky tofu, some people love to be monsters in the eyes of foreigners; find their own way of gold extraction and keep trying, and you will also be your own master of coffee.

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