Coffee knowledge: how long does it take to grow coffee and beans? what is the exhaust?

Professional coffee knowledge exchange More coffee bean information Please pay attention to coffee workshop (Weixin Official Accounts cafe_style)

The fresher the coffee? The better is not exactly true.

Although no one wants to drink old beans, roasted coffee beans brewed directly, its flavor will certainly disappoint you, because the coffee is still in a lot of exhaust state.

What is exhaust?

Exhaust is the process by which coffee beans emit gases after roasting. When you roast coffee, a lot of carbon dioxide and gases are produced inside the coffee beans.

The problem is that these gases release small bubbles as you brew, which can disrupt the coffee powder's contact with water, resulting in uneven extraction of flavor and aroma substances.

In other words, if you brew freshly roasted coffee, these gases can negatively affect the flavor of your coffee.

For this reason, it is better to wait a few days after roasting before making coffee. This period of time during which carbon dioxide and chemical changes are emitted is called exhaust.

If the coffee beans are used for hand brewing or pressing, they can be used as soon as possible after roasting for a few days, because coffee has a long contact time with water, so there is no need to exhaust too much gas.

On the contrary, when we want to brew espresso coffee, because the brewing time is very short (usually only 20 seconds), it means that bubbles will affect the extraction result to a greater extent.

Joe said: "espresso coffee is special, it needs a longer period of cultivation, you don't see fresh roast coffee directly to extract concentrate, the key is to cultivate beans, exhaust, let coffee brew its flavor."

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