Coffee making method how to make coffee
The pressure of water is 9 ±2 atmospheric pressure (bar). The general hot water brewing method can only extract the water-soluble substances inside the coffee, and the extra-strong Italian coffee can further extract the water-insoluble substances by high pressure. These high pressures will completely emulsify the lipids inside the coffee and dissolve it into water, which is the main source of "body". Emulsification will make the taste of espresso more sticky; and stickiness will form a lower surface tension, more able to invade the taste buds, so that mellow reverberate in the mouth for a long time. The most important sign of a good espresso is that it has a light camel-colored emulsion, which is a mixture of fat, water and air in the coffee during the extraction process. The emulsion should be uniform in color, about 3 cm to 5 cm thick, shake the coffee cup gently, and this layer of emulsion will stick to the wall like thick syrup. If the emulsion is dark brown or even black, the coffee is overextracted; if it is yellowish, the coffee has not been fully extracted.
Extraction time
The extraction time was 30 ±5 seconds. When extracting strong espresso, the quality of extracting two cups at the same time is more perfect than that of one cup alone. The extraction time for making two 1-ounce cups of espresso should be between 25 and 30 seconds. In addition to time, if the color of espresso begins to fade, the production process should be completed. The goal should be to make dark red espresso without changing color within 25-30 seconds.
Filter handle and filter
The filter handle must be kept at the same temperature as the water temperature for making espresso. Therefore, the handle should be preheated on the head of the machine.
Machine cleaning
If the machine, filter and filter handle are not cleaned, the extra-strong espresso will smell of rotten oil.
Environmental factors
The humidity and temperature of the air will change during the day. Because coffee powder is easy to absorb moisture, the thickness of the bean grinder also needs to be adjusted so that the thickness of the powder can reach 25-30 seconds during extraction.
Extra strong espresso cup
In order to maintain the heat and aroma, the espresso cup has a thick wall and a narrow mouth. Special espresso cups should be preheated
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There are several procedures for making coffee beans into coffee.
First of all, coffee beans are picked from coffee trees, and then they are roasted, then ground and finally brewed, and the achievement is a cup of coffee beans. Coffee beans are roasted using specific equipment, and the starch is converted into sugars and acids at high temperature. in this process, substances such as cellulose will be carbonized to varying degrees, and water and carbon dioxide will be volatilized.
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How to avoid a series of problems in making coffee
Avoid problems: first, the choice of the coffee pot: according to the current coffee cultural atmosphere is slowly developing, the coffee brewing equipment market is not very sound, when buying, we must pay attention to the uniform thickness of the glass of the coffee pot, the cup and bucket is vertical, and the caliber is the same. The metal shelf outside should be strong and hard. Second, water temperature: too high water temperature will deteriorate the oil quality of coffee, making coffee
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