What's the difference between iced coffee, cold extracted coffee and cold brewed coffee? introduction to the taste characteristics of three kinds of iced coffee

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It's May, and summer is coming. Hot summer in Guangzhou, even if it rains, it is still so muggy, without a cold drink, Guangzhou really does not have the courage to live in this fireplace. Therefore, recently, many friends have come to the Qianjie coffee shop to order a cold cup of coffee, and many of them say they want iced coffee. At this time, the question arises: is it iced coffee, cold coffee or iced coffee?

Then there is another question: what is the difference between these three types of coffee? Next, Qianjie Coffee will share with you the differences between these three kinds of coffee.

First of all, we all know that these three types of coffee have one thing in common, that is, the temperature is very low. First of all, to understand a basic concept, the production of coffee is the process of extracting some of the substances from coffee. But if this part of the substance is not extracted, it is called "insufficient extraction". If the extraction is finished and the extraction continues, the unwanted substances will be extracted, which is called "over extraction". As we all know, the extraction of coffee is closely related to temperature and time. The higher the temperature of the hot water, the faster the movement of the ingredients: the sour ingredients move the fastest, while the bitter ingredients move the slowest, but as the temperature increases, the total amount of taste increases, and the more bitter ingredients reach the surface. On the contrary, the lower the temperature, the longer it takes to extract a certain amount of flavor.

Ice drop coffee

Ice drop coffee, as its name implies, is filled with ice in a specific container, allowing the ice to naturally melt into water, while letting the water drop to the coffee powder. It takes a long time to make an ice drop coffee, and the ice drop coffee in the front street coffee shop usually takes 8 hours to complete the extraction. After the extraction is completed, the coffee liquid needs to be chilled in the refrigerator for 12 hours to ferment during this period of time.

[the way of making ice drop coffee in front street]

Coffee powder cup contains 60g coffee powder, extract 600ml coffee liquid, powder ratio at 1:10. In the choice of grinding degree, because the water temperature of contact powder is lower than that of ordinary hand-brewed coffee, it will choose a slightly finer scale than hand-brewed coffee. Judging by the No. 20 sieve, the screening rate will be about 85%. The mixing ratio of ice to water is about 1:1 and the throttle valve is controlled at a flow rate of 7 drops / 10 seconds. And spread a piece of moist filter paper on the powder bed for more uniform extraction. The whole extraction time lasts about 6-8 hours. After the extraction is completed, the coffee liquid will be bottled in the refrigerator for 12 hours before drinking.

Cold extracted coffee

Cold-extracted coffee is very simple and convenient. To put it simply, the coffee powder is put into clear water, soaked and extracted for a long time in cold storage, and then the coffee powder in the mixture of coffee powder and coffee liquid is filtered through filter paper. Finally, a clean coffee liquid is obtained.

[Qianjie Cold extract Coffee making method]

On the basis of 50 grams of coffee powder, in the choice of grinding degree, because the water temperature in contact with coffee powder is lower than that of ordinary hand-brewed coffee, we choose a slightly smaller scale than hand-brewed coffee, that is, the pass rate of No. 20 standard sieve is 85%. Put the coffee powder into a glass bottle, then add 400ml of normal temperature water and 200g hard ice cubes (a total of 600g ice-water mixture) to the bottle at 1:12, then stir the coffee powder and water well with a stirring stick. seal and store in the refrigerator.

After putting it in the refrigerator for 24 hours, use filter paper to filter out the coffee grounds to get a clean coffee liquid, then use a clean sealed bottle to put the coffee liquid into a clean bottle and refrigerate it for about 4 hours before drinking.

Ice hand to make coffee

Ice hand brewing coffee is also called Japanese ice hand brewing, which can be understood simply as normally brewed coffee diluted with ice cubes to cool down. In order to avoid diluting the taste of coffee with ice cubes, ice hand brewing coffee will reduce the proportion of powder and water when brewing. Brew it with less water to get a cup of coffee with a higher concentration, and then add ice to cool it.

[the way of making ice hand coffee in front street]

Take 15 grams of coffee powder as an example, the degree of grinding is finer than that of hot hand-brewed coffee, such as light roasted coffee with a grindability of 85% of the 20 sieve. The ratio of coffee powder to water and ice is 1:10:5, and the water temperature is the same as usual. The water temperature of light roasted coffee is 90 ℃-93 ℃ and that of medium roasted coffee is 87 ℃-89 ℃. Ice hand brewing coffee is the same as hot hand brewing, using three-stage extraction. After cooking, shake or stir the filter cup to allow the ice to come into full contact with the coffee liquid, cool quickly, and keep the concentration consistent.

The difference between ice drop coffee, cold extract coffee and ice hand brewed coffee

Ice hand brewing coffee is essentially the extraction of coffee substances in the middle and front of the coffee, and then an equal proportion of ice is cooled and diluted to the right temperature concentration. Therefore, it will be clean and refreshing in the taste, and it is easy to highlight the main flavor of coffee.

Because ice drop coffee is extracted with ice water for a long time, more small molecules (such as flower aroma, acid) are extracted, while macromolecules (such as the bitterness of tannin) are more difficult to extract. In addition, after the production is completed, it will be fermented at a low temperature for 12 hours, so there is an obvious sense of fermentation in the flavor and the sweetness of the coffee bean itself, and the taste will be cool and delicious.

Cold coffee shows that the liquid is not as clear as ice drop coffee, the surface will also float a thin layer of oil, in flavor and taste compared to ice drop coffee will appear slightly thick and balanced. Compared with thermal extraction, sweetness and bitterness are not easy to feel, but sour taste is easier to feel. Because of the low temperature, the flavor is long-lasting.

Are cold-extracted coffee and iced coffee high in caffeine?

Recently, a friend asked Qianjie about caffeine. Do cold extract coffee and ice drop coffee have high caffeine content? What is the caffeine content of espresso and instant coffee? How much coffee do I drink every day so as not to endanger my health?

Many people think that the caffeine content of ice drop coffee is low, because the lower the water temperature, the less easily caffeine dissolves (the lowest temperature of caffeine dissolution is above 80 degrees Celsius). However, the low amount of caffeine extracted by cold water should not be underestimated after a long period of extraction. The caffeine content of the coffee beans used varies greatly with the difference of the water drop interval and the total extraction time. As for the content of some packaged instant coffee on the market, you can refer to the package. As for how much to drink can endanger your health, an authority says the safe caffeine intake for adults should be 400 milligrams a day. On this basis, we also need to see how sensitive the drinker is to caffeine.

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