Coffee knowledge points: roasting, grinding and brewing are the three steps of coffee.

Roasting, grinding and brewing are the "three steps" of coffee.

The key points of grinding coffee beans: 1. The degree of grinding should be average; 2. Friction heat occurs when grinding beans; 3. Does not produce fine powder; 4. The degree of grinding suitable for extraction is selected.

The degree of grinding should be understood simply and averagely. The coffee powder with fine grinding degree has a larger surface area and more extracted ingredients. The more soluble ingredients, the thicker the liquid, the stronger the bitterness. Therefore, if the uneven grinding coffee powder is mixed and extracted, the concentration of soluble components will be inconsistent, sour and bitter taste will be extracted, and the coffee will become turbid and have a lot of smelly liquid.

Generally speaking, according to the different structure of the bean mill, the bean mill is divided into flat mill and cone mill (cutting and grinding). Among them, the flat grinding powder is average, it is not easy to produce friction heat, but there is a lot of fine powder; the cone grinding powder is not easy to average, easy to produce friction heat, but the fine powder is less. In addition, the baking degree of coffee beans will also affect the friction heat when grinding beans. It should be noted that the general household manual bean grinder (cone mill) is relatively easy to produce friction heat, but because the family environment is generally finished immediately cooking and drinking, the coffee powder ground by the cone mill is basically not much different from the flat grinding powder.

Can not produce fine powder in the grinding process, the effect of fine powder is more groove. Generally speaking, the high-temperature charged fine powder will be attached to the inside of the bean grinder and mixed into the new coffee ground next time after rancidity. Coffee with fine powder will have an obvious astringent taste when brewed. To avoid the production of fine powder, try to choose a mill that will not produce fine powder, or carefully clean it with a brush at the end of each grinding.

Select the extraction methods suitable for fineness grinding: Turkish copper kettle, mocha pot, espresso machine; extraction methods suitable for moderate grinding: filter paper dripping method, flannel drip filtration method, plug air kettle (siphon pot); extraction methods suitable for coarseness grinding: water drip coffee machine, drip filter pot.

Tips cleaning the bean grinder is a very necessary action to avoid the influence of fine powder. In addition, when the bean grinder produces abnormal fine powder, we need to pay attention to the wear of the blade. (generally speaking, the frequency of the household bean grinder is low, and the blade wear is not common.)

Source: network