General knowledge of Fine Coffee processing of coffee beans before grinding

First, peeling: the peel and most of the pulp are removed mechanically.

Second, fermentation

Third, drying

Fourth, roasting: through roasting, raw coffee beans can release the special aroma of coffee. Each coffee bean contains its fragrance, sour taste, sweetness and bitterness. How to release it incisively and vividly depends on the heat of its baking. From the insipid raw beans to the endless aftertaste in the cup, roasting is a very important step in the long journey of each coffee bean. Coffee beans are about 10 or 20 minutes long (inversely proportional to the temperature) and the temperature is as high as more than 200 degrees Celsius. In the process of dialogue with the hot dish, coffee beans undergo many chemical changes, giving off a first explosion, a second explosion, a sound like popcorn, and loss of moisture. From raw beans, light and medium roasting to deep roasting, moisture is released again and again, the weight is reduced, but the volume expands and bulges, the color of coffee beans deepens, the fragrant oil is gradually released, and the texture becomes crisp. In raw beans, there is a lot of chloric acid, which gradually disappears with the baking process, releasing familiar and pleasant fruit acids such as acetic acid, citric acid and malic acid in wine. Baking is just right to present these beautiful sour flavors.

Light baking-when the beans make the first light sound, the volume expands at the same time, and the color changes to a delicious cinnamon color. Acidity dominates the flavor of shallow roasted beans, texture and taste have not been brought into full play, generally used as canned coffee.

Medium roasted-coffee beans show an elegant brown color. This method of baking is also called city roast. Medium roasting can not only preserve the original flavor of coffee beans, but also moderately release aroma, so the blue mountains of Jamaica, Colombia, Brazil and other individual coffee, more choose this roasting method. At 20 minutes, the oil begins to surface, and the beans are burned into an oily dark brown, called full-city roast, when the sour, sweet and bitter taste of coffee reaches the perfect balance, and the character of coffee beans is clearly depicted.

Deep roasting-the darker the color of the coffee beans, the sweeter the flavor, when the oil has turned into caramel, bitter back to sweet, endless aftertaste, the most suitable for the strong Italian Espresso, so it is also called Italian baking. Moderate roasting gives life to the coffee beans and turns them into intriguing sweetness and bitterness. People who are sensitive to caffeine might as well choose deep-roasted beans, because in the process of deep-roasting, caffeine will slowly escape, so the deeper the roasted beans, the lower the caffeine content, the caffeine content in a cup of Espresso is only half that of other medium-roasted coffee, the general Espresso coffee has less capacity, and the caffeine content is much higher if it is equal to the capacity of ordinary coffee.

It should be noted that the roasting of coffee beans is divided into primary roasting and secondary roasting. The difference depends on the size of the coffee shop. Due to resource constraints, small coffee shops have only one machine, which requires the entire roasting process to be completed at once, while for larger coffee shops, there will be at least two machines that can work together to complete the baking process in two stages. After the second roasting, the acidity of the coffee beans is greatly reduced, the aroma is clear, and the taste is sweet and refreshing.