What is coffee fat (Crema)? Deconstructing the Oil Secret of espresso
Professional coffee knowledge exchange more coffee bean information please follow the coffee workshop (Wechat official account cafe_style)
The espresso that everyone likes to drink is based on espresso (Espresso), so a good cup of espresso can be called the soul of coffee. When it comes to espresso, oil must be an important indicator that can not be ignored. Because oil not only gives espresso important visual characteristics, but also changes the flavor and taste of espresso to some extent. But what exactly is this layer of grease?
The manufacturing process of grease
To understand how these oils are produced, you must first understand the process of making espresso. Take a professional espresso machine as an example, use 18 to 20 grams of coffee powder and extract 35 to 40 grams of espresso at 9 atmospheric pressure (9 Bar). High temperature, high pressure, with the right coffee powder, can make a cup of espresso.
When espresso is first extracted, there will be a golden to chocolate grease on the surface; this layer of oil is inextricably linked to pressure. When the water is heated and pressurized, the soluble substances in the coffee powder layer will be extracted, and this process will emulsify the natural fat and oil in the coffee. At the same time, freshly roasted coffee beans contain carbon dioxide, which is under pressure and melted into coffee in the process of making espresso. However, when hot water flows through the coffee pressed powder and comes out of the powder bowl, it can return from nine atmospheres to the normal one. At this time, because of the pressure gap, the carbon dioxide expands, and the oil wraps the carbon dioxide, and because the oil is lighter than water, it forms the so-called grease.
Grease = good espresso?
Oil reflects the condition of raw coffee beans. The more fat, the more natural oil content of coffee beans, that is, the freshness of coffee beans. However, coffee with fat does not necessarily mean that it is a good espresso, such as Robusta (extended Reading: have you had the right coffee? (coffee beans are rich in oil.
Espresso is actually the most direct and simple way to show the original flavor of coffee, so poor beans, poor grinding, poor powder pressing, improper machine operation, too short or too long extraction time, etc., will affect the flavor of a cup of espresso. So the next time you have an espresso, don't rush to judge whether the coffee is good or bad by fat.
A good espresso should taste well-balanced, round and smooth in the mouth, and have the flavor of the place of origin (fruit acid, flower flavor, etc.), not blindly bitter. Remember to take a sip slowly, taste the flavor, and you may like to drink espresso from now on.
- Prev
Is it a trend to "fail to do one's proper job"? Luxury brands have gone to sell coffee?
Professional coffee knowledge exchange more coffee bean information please follow the coffee workshop (Wechat official account cafe_style) Ralph Lauren also push the coffee cart? Right! You read it right! In addition to selling clothing accessories, luxury brands have also set up sideline businesses to sell another piece of space in the recession. At the beginning of this year, the compound space Gucci Garden opened in Milan, except shops and art galleries.
- Next
Bilibili enters the coffee industry? Bilibili themed coffee shop opens today!
Professional coffee knowledge exchange more coffee bean information Please follow Coffee Workshop (Wechat official account cafe_style) following the launch of China's first themed convenience store with Rosen at the beginning of the year, China's well-known video barrage website bilibili (bilibili) recently opened a bilibili-themed coffee shop in Yangpu District, Shanghai. Under the stimulation of two-dimensional culture, bilibili also got the canopy.
Related
- A coffee shop drives customers out on the spot?! Store: No Chinese people are accepted
- Children suffocated and died after drinking pearl milk tea! Parents: The store did not inform the risk
- Can I put a thermos in a thermos pot to keep my coffee warm? Why does coffee not taste so good after it cools down? What is the most suitable amount of milk for latte?
- How to make coffee cream? Do I have to use instant powder for 400 hand-made coffee? What is the composition of coffee cream in Naples coffee?
- What is an authentic cappuccino? How to make cappuccino golden circles? What is the ratio of coffee to milk in a cappuccino?
- Can espresso beans be used to make hand-brewed coffee? What is the difference between Italian mixed beans and hand-made single beans? What are the characteristics of SOE coffee beans?
- Big battle! Mixue Ice City has opened three stores in the United States?!
- Lucky launches rice milk latte! Netizen: After drinking it, I thought I bought it an ordinary latte
- Remove the perimeter! Naixue's largest flagship store in the world quietly closed!!
- Manner Co-branded Cup is a literary style?! Netizen: I almost didn't recognize it