The size of the coffee bean grinding powder depends on the way it is cooked.

When grinding the beans, the thickness of the powder depends on how it is cooked. Generally speaking, the shorter the cooking time, the finer the ground powder; the longer the cooking time, the coarser the ground powder. In terms of actual cooking, ESPRESSO machines take a short time to make coffee, so the ground coffee is the finest, and the coffee powder is as fine as flour; in the "plug wind" method, it takes about one minute to cook coffee, and the coffee powder is medium; American filtered coffee takes a long time to make coffee, so the coffee powder is the coarsest, like the Beijing grain on the shell beach. Ground coffee powder with appropriate thickness is very important for making a good cup of coffee, because the extraction of water-soluble substances in coffee powder has its ideal time, if the powder is very fine, and cooked for a long time, resulting in excessive extraction, coffee may be very bitter and lose aroma; on the other hand, if the powder is very coarse and cooked too fast, resulting in insufficient extraction, then coffee will be tasteless, because there is no time to dissolve the water-soluble substances in the powder.

Coffee grinders come in a variety of brands and models, but ideally one that can adjust the size of the ground beans. When grinding with a bean grinder, do not grind too much at a time, enough powder for one use is good, because the longer the bean grinder is used, the easier it is to generate heat, which indirectly causes the coffee beans to be heated in the grinding process and causes the aroma to be released in advance, which will affect the aroma of the cooked coffee.

Coffee beans contain grease, so the grinder must be cleaned after grinding, otherwise the grease will be dirty, and there will be a stale smell for a long time. Even the high-grade beans will be ground into strange powder. After each use of the bean grinder, be sure to wipe the blade machine with wet market and clean the plastic top cover with warm water. But for flavored coffee popular in the United States, the added flavor is strong and heavy, and it will last a long time. It is best to put two spoonfuls of white sugar into it before washing. Of course, it is best to grind only the same kind of beans in a grinder, so there is no problem of mixing flavors.