Coffee bean roasting: from raw to aromatic

Coffee bean roasting: from raw to aromatic

The roasting process of coffee beans is to transform the raw coffee beans into a finished product with rich aroma and taste through a series of heating and processing steps. During this process, the coffee beans undergo great changes in color, texture and taste. The following will detail the transformation from raw to mellow.

1. Green coffee stage

In the green bean stage, after the coffee fruit is picked, it is still wrapped in a hard shell that is dehydrated to protect the immature seeds. These seeds are what we call coffee beans. When they are just picked, they are light yellow or green and contain a high amount of water.

2. Peel and remove the flesh

In the peeling and pulping stage, the hard shell and pulp are separated by mechanical methods. At this time, clean and moist coffee beans with a layer of sticky substance on the surface are obtained.

3. Fermentation

Fermentation is an important step that helps remove sticky substances from coffee beans and affects the final taste and flavor. In this process, coffee beans are placed in a specific environment to ferment, which usually takes several hours to several days. The longer the fermentation time, the richer the flavor of the coffee beans.

4. Penetration baking

Permeation roasting is a process where wet coffee beans are exposed to high temperatures. During this process, water begins to evaporate and internal chemical reactions begin to accelerate. As time passes and the temperature rises, the surface of the coffee beans becomes dry and the color gradually changes to yellow, brown or even black.

5. Preparation

Processing refers to the reprocessing of coffee beans that have been roasted to enhance their aroma and taste. This stage usually includes multiple heating, cooling and exhaust processes. Through different processing methods, coffee beans can reach different roasting degrees, thus showing various flavor characteristics.

6. Cooling and storage

After being brewed, the coffee beans need to be cooled to stop the internal chemical reaction. During the cooling process, the coffee beans will emit a rich aroma and gradually become dry. After cooling, the coffee beans are stored in appropriate containers.

7. Grinding and Brewing

Finally, before enjoying a cup of delicious and mellow coffee, we need to grind the stored coffee beans and brew them with water. This step can release the maximum extraction of taste, flavor and aroma.

In summary, in the process of transformation from raw to mellow, each stage has an important impact on the final quality. By mastering the processing methods and techniques required at different stages and adjusting the parameters according to personal taste preferences, you can also try to roast your favorite coffee flavor at home.