What are the kinds of coffee beans that are not sour? how can we make them sour?

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Arabica refers to the species of coffee beans, corresponding to Robusta. The main difference between the two kinds of coffee is that the former is rich in taste and deep in layer, so it is suitable for taste, while the latter has a single taste, bitterness and more caffeine per unit weight, so it is often used to make instant coffee. This is the difference between the two most common types of coffee, but Arabica coffee has more categories depending on the region where it is produced, such as Kenya, Yega, Colombia, etc., which have their own tastes, including the relatively bitter ones.

The reason why I think lavazza is bitter is because he has a certain amount of Robusta coffee beans, and this is also the reason why the subject feels that the taste of Robusta is not thick enough. I think there is only one word "bitter" in Robusta's taste. Secondly, it is related to the bitter taste of coffee, including the degree of baking. Generally speaking, the greater the depth, the more it can stimulate the bitter taste of beans and suppress the sour taste. But if it is too deep, it will volatilize the unique aroma of the coffee during the roasting process, and you will lose some of the characteristics of the coffee. In addition, the cooking method of coffee also affects the taste of coffee, according to preference, coffee extracted by mocha pot or steam pressure is more suitable; finally, the temperature of coffee will also affect, hot coffee may be more suitable for requirements.

To sum up, I would personally recommend medium-and deep-roasted Mantenin coffee beans, which are bitter on the one hand and nutty on the other. For branded beans, the best ones available on the market are lavazza, illy or beans baked by large coffee chains like Starbucks. I personally recommend red cans of illy (if you don't think it's sour enough, you can buy black cans) and Starbucks Guatemala.

Lavazza's words are indeed a little worse than these two. Beside the point, the preference for coffee must vary from person to person, but good sour coffee is definitely a very good experience. It is recommended to drink Yega Snow Coffee or Starbucks in Kenya, where there is usually a faint scent of flowers. The latter is Kenya, where I have recently had a very pleasant citrus flavor, and it's really good to drink ice on a hot day!

Finally, it is suggested that the subject should buy a bean grinder, just shake it by hand, and buy ground beans. Individuals don't drink so fast. Coffee beans pass quickly after grinding, and they will only taste worse and worse.