What does resting mean for coffee beans after roasting?

Freshly roasted coffee beans hold large amounts of carbon dioxide, and that gas blocks hot water from evenly extracting flavor compounds. Resting lets the beans degas naturally until the remaining gas no longer interferes, which is when they enter their peak flavor window. Awakening is a faster method that accelerates degassing so very fresh beans can be brewed sooner.

Resting time follows roast level, and the common assumption is wrong: darker roasts need longer resting, not shorter, because they spend more time in the coffee bean roaster and build up more carbon dioxide. Both resting and awakening serve the same goal, reducing internal gas, but they differ in duration and method, so pick based on how soon the beans will be used.

Freshly roasted coffee beans contain a large amount of carbon dioxide, and this gas interferes with the extraction of flavor compounds by hot water. Therefore, the beans need to be rested or awakened to reduce their internal gas content. Resting the beans means letting them degas naturally and waiting for them to enter their peak flavor window; awakening the beans means temporarily accelerating degassing before brewing so that overly fresh beans can be used as soon as possible. Both serve the same purpose but differ in duration and method. Resting time is related to roast level, and dark-roasted beans actually need longer. This article explains in detail the difference between resting and awakening beans and the meaning of the peak flavor window, and includes practical suggestions from Front Street.

So we need to use certain specific methods to reduce the carbon dioxide content in the beans to a certain level, so that hot water can more evenly extract the flavor compounds in the coffee. There are mainly two specific methods: "resting" and "awakening." Some friends may not be very familiar with them, especially the latter. No worries! Today Front Street will share what resting beans is and what awakening beans is!

What is resting beans? So-called resting beans refers to the period during which freshly roasted coffee beans degas naturally and release a large amount of carbon dioxide from within. When the carbon dioxide inside the coffee beans has been released to the point where the remaining amount is no longer enough to affect extraction, it means the beans have rested well and entered their peak flavor window. It is actually the same idea as fattening a pig before slaughtering it! Because the rested beans have released carbon dioxide, hot water can more easily extract the flavor compounds in the coffee, so the coffee can more fully express its own deliciousness.

Generally speaking, the resting time is determined by the roast level of the coffee beans. Although many friends think that dark-roasted coffee beans have a looser structure, so their resting time should be shorter than that of light-roasted coffee beans, in fact it is exactly the opposite: the darker the coffee beans are roasted, the longer the required resting time. This is because the darker the coffee beans are roasted, the longer they have spent in the roaster, and the more carbon dioxide has accumulated inside them! Even though their structure is looser, because the carbon dioxide content is simply too high, degassing also takes more time.

Generally speaking, Front Street recommends resting light-roasted beans for 3–5 days, while dark-roasted beans should rest for 5–7 days, so that delicious coffee can be extracted more consistently. What is awakening beans? "Awakening beans" is a relatively unfamiliar term for most people. Because the chances of using it are very few, it is not surprising that even coffee professionals with many years in the industry do not know it. And awakening beans does not mean waking the coffee beans up! Rather, before brewing, the coffee beans to be used are taken out of the bean bag and then left for a short time. This exposes them to a larger amount of fresh air, thereby speeding up the loss of carbon dioxide. Because the coffee beans received are often too fresh, and some friends cannot wait to brew a pot, they use this method to reduce the extraction obstruction caused by excessive carbon dioxide.

But doing this actually still takes a relatively long time. Without grinding, the contact area of the coffee beans is comparatively small. Although it is faster than conventional resting, it still takes at least an hour or so. Therefore, Front Street recommends grinding the coffee beans first and then leaving them to sit. This greatly increases the surface area of the coffee beans, and the "awakening" time is shortened to just a few minutes, so we can enjoy delicious coffee faster!

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The above content is compiled by CoffeeHunters, a coffee news website.