Black coffee is coffee without any modification. Black coffee brings the original feeling of tasting coffee. When you brew coffee with a small home coffee machine, you can directly see the foam on the coffee. If brewed properly, the foam should be uniform yellow-brown. If coffee beans are mostly arabica varieties, the foam is delicate, dark brown and reddish; If it is mainly Robusta, the foam is loose, dark brown with gray stripes. A cup of sweet and delicious coffee, for black coffee lovers, in addition to the mellow and round taste, the most attractive thing is the slightly mysterious and attractive aroma floating out during the brewing process. Therefore, the so-called taste of a cup of coffee should start from the moment of making coffee. After coffee is cooked, you should smell its fragrance before tasting it, and then observe its color; Only coffee with clear colors can bring a refreshing and round taste to the mouth. Then sip coffee. Don't rush to drink coffee at this time. Put it in your mouth for a while, let the coffee mix with saliva and air slightly, feel the feeling of coffee in different parts of your mouth, and then gently let the coffee enter your stomach. Only by combining the sense of smell, sight and taste with appreciation can we truly appreciate the essence of a cup of black coffee. Only in this way can we enjoy the original four flavors of black coffee: sweet, sour and bitter. Aroma black coffee emphasizes the aroma of coffee itself. Aroma is the life of coffee quality, which can best express the making process and baking technology of coffee. The climate, altitude, variety, refining treatment, harvesting, storage and baking technology of the consuming country are all conditions that determine the aroma of coffee beans. Bitterness The bitterness of black coffee is the basic taste of black coffee, which is different in strength and texture. Raw beans only contain a very small amount of bitter ingredients, and then the most symbolic bitter taste of coffee is produced by carbonization caused by sugar, partial starch, fibrous caramelization and baking. Sour black coffee also has a sour taste. Proper heating will produce moderate acidity, which will make coffee taste better and make people feel deeper. The sweetness and bitterness of sweet black coffee are integrated, so the refreshing taste of superior black coffee must be sweet. Coffee will produce different flavors at different brewing stages. At the beginning of brewing, the aroma of coffee is like raw coffee beans, and the taste is extremely astringent, and the subsequent aroma will gradually turn mellow. After coffee is cooked, you should smell its fragrance before tasting it, and then observe its color; Only coffee with clear colors can bring a refreshing and round taste to the mouth. After that, sip coffee. Don't rush to drink coffee at this time. Put it in your mouth for a while, let the coffee mix slightly with saliva and air, and feel the feeling of coffee in different parts of your mouth at the same time, then gently let the coffee enter your stomach.