What determines the bitterness and sour taste of coffee?

There have been several times, Qianjie after consulting guests do not like sour coffee, then recommended Mantenin, but the guests said that he had drunk Mantenin, is sour …...

In general, Mantenin's flavor is the flavor of herbs, nuts, chocolate and caramel, and there is no sour taste. So is it possible for Mantenin to smell sour? Yes, and it's very simple. Just don't bake the coffee beans so deep. In our impression, the coffee beans of Ethiopia and Kenya are sour, while those of Blue Mountain and Manning are bitter. But in fact, the sour and bitter of coffee does not have much to do with the region, mainly related to the degree of roasting. In coffee roasting, the period after a burst point is called the development period, which will determine the final flavor trend of coffee, the shorter the development period, the shallower the baking degree, and the more sour the coffee flavor trend; on the contrary, the longer the development period, the longer the caramelization reaction, the deeper the coffee roasting degree, the more bitter the coffee flavor trend. Sour and bitter are only the main tone of coffee flavor, but if coffee has only sour taste or only bitter taste is unpleasant, the most important thing is to highlight sweetness and aroma. For example, Kenyan coffee beans are as famous for light roasting as deep roasting in the consumer market, and light-roasted Kenyan coffee shows an acidity as bright as plums and tomatoes; deep-roasted Kenyan coffee is as bitter and sweet as dark chocolate. Some friends may wonder why, in the era of light roasting coffee, coffee such as Manning and Blue Mountain still insist on deep roasting, coupled with remarks such as "roasting coffee beans deep to cover up defects." it makes people wonder whether the quality of these deep-roasted coffee beans is not as good as that of light-roasted coffee beans. There is no denying that whether high-quality coffee beans or low-quality coffee beans, if roasted to a level close to charcoal, the taste is highly consistent, that is, bitter to doubt life. But it is clear that, no matter Blue Mountain or Manning, the taste of these deep-roasted coffee is not simply bitter, but sweet in bitterness. If there are poor quality beans in it, then the taste feedback will make it impossible to hide.

Coffee beans such as Blue Mountain and Manning have been famous all over the world before the rise of shallow roasted coffee. Mellow, balanced and rich are the labels of these coffee, and even Blue Mountain is considered to be the standard "coffee flavor". In this case, keeping the same flavor quality is exactly what these coffee beans want to insist on! Of course, under the tide of "boutique coffee", some shops can still drink shallow roasted Blue Mountain and Manning coffee with sour taste.