Coffee made the greatest sacrifice-- to pieces.

Before brewing coffee, the beans must be ground into fine grains to increase the contact area between water and coffee in order to extract the delicacy. In fact, the bean grinder is more important than the coffee machine. At present, most people choose the "sawtooth grinder" because it can grind uniform coffee powder quickly and steadily. The operation method of the sawtooth bean grinder is very simple, generally speaking, it will have two setting functions, one is to set the grinding degree, the other is to set the grinding time. The degree of grinding is mostly expressed in Arabic numerals, and the smaller the number is, the finer the grinding is. On the top of the bean grinder is a funnel shaped box containing unground beans, and below is a drawer to hold the ground coffee powder. When you choose to buy a bean grinder, you should pay attention to its power, usually between 70 watts and 150 watts, the higher the better, the higher the power, the faster the grinding speed, and the shorter time the coffee powder stays in the sawtooth, so it can grind the coffee powder at low temperature.

Brewing: to brew a good cup of coffee, you should not only have fresh coffee powder and slightly harder water, but also a set of easy-to-use brewing tools. There are three main types of coffee machines in common use.

Drip filter: wet the coffee powder with water and let the coffee liquid flow through the filter cloth or filter paper and flow into the container at the speed of natural fall. Basically, this method does not soak the coffee powder, just let the hot water pass slowly through the coffee powder. Both the drip cup and the electric coffee maker fall into this category and are the simplest brewing tools that can make clean and brightly colored coffee.

Bubble type: put the coffee powder into the pot, soak it in hot water for several minutes, and then filter out the coffee grounds by a filter cloth or screen to form a cup of coffee liquid.

Siphon pots, drip pots, Belgian coffee pots and Vietnamese coffee pots are all follicular brewing tools, and they all have a soaking process to form a more complex taste.

High-pressure type: use pressurized hot water to penetrate the compacted coffee powder to produce a thick cup of coffee in this form of tools such as a mocha pot and an espresso machine.

Quick brewing method: can use Italian espresso machine, faster coffee brewing method. The espresso machine can extract several cups of coffee successively. The oil and gum in the coffee beans can be emulsified and dissolved under high pressure during the brewing process, and the essence of the beans is completely extracted by pressure, making the brewed coffee stronger, better in taste and flavor.