The starting point of a good cup of coffee lies in the quality and freshness of the coffee beans themselves. Green beans are bluish-green in color and keep well, but only after roasting do they release their aroma; once roasted, coffee beans continuously lose flavor over time, and the finer the grind, the faster the loss. This article begins with the roasting changes in coffee beans, explains how to lock in flavor as much as possible under limited conditions, and offers key points for choosing a shop that roasts fresh beans along with home storage methods, helping you shorten the time from roasting to brewing and from opening the bag to finishing it, so you can drink coffee that is closer to its optimal state.

The starting point of coffee is the coffee bean itself, and if you want to taste delicious coffee, the first step is to buy fresh coffee beans. The coffee beans you generally see on the market are brown, but raw coffee beans have a bluish-green color. Coffee beans in their raw state are easier to store for a long time, but raw coffee beans cannot be ground directly into coffee powder; raw beans must undergo roasting before they develop the aroma of coffee.

However, the tannic acid contained in coffee also volatilizes into the air during roasting, causing the coffee's flavor to gradually dissipate over time. The finer the coffee beans are ground, the faster their flavor volatilizes. Under ordinary storage conditions, this situation is difficult to avoid unless oxygen is blocked out and the beans are stored at a high level of freezing, which is the only way to completely suppress the loss of coffee's distinctive flavor. Therefore, if you want to savor coffee at its best, the most important things are how to shorten the time from roasting to extracting the essence of the coffee, and how to shorten its exposure to air.

How can you buy coffee beans that have just finished roasting? If you are not afraid of trouble, you might buy fresh raw coffee beans yourself and roast them at home. However, if you roast at home, your technical skill may be somewhat lacking, and only with practiced technique can you roast top-grade coffee beans. For this reason, it is more time-saving to buy already-roasted coffee beans on the market, and it is also more reliable in terms of technique. If you want to taste a good cup of coffee, you must find a shop that sells fresh roasted beans. When choosing, a shop with many customers should be your first choice. In addition, if you want to tell whether the coffee beans sold by a shop are good or bad, you might observe the following points:

1. Is the glass display case holding the coffee beans directly exposed to sunlight?

2. Is the air in the shop on the hot and humid side?

3. Is the glass display case dirtied by coffee bean oils, husk fragments, and the like?

4. Is the overall storefront clean and bright?

If you have bought coffee beans, how should you store them? To keep the flavor of the coffee beans you bring home in good condition, as soon as you get home you should put them into a vacuum bag and seal them properly, preferably in a place with lower temperature and humidity. At home, this is mostly the refrigerator, but be sure there are no strange odors in the refrigerator. Ground coffee beans should also be used up as soon as possible, within one to ten days, to avoid the coffee's flavor deteriorating.

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