When the espresso machine makes espresso, the coffee powder must be pressed hard to resist high-pressure hot water, so as to extract the essence of coffee.

So it is sensitive to the degree of grinding. The more uniform the grinding, the denser the pressed coffee powder will be, and the fewer the gaps will be, which can produce balanced resistance to water, so that a cup of espresso can be successfully extracted. So the coffee to be used is extremely fine.

Italian coffee machine puts the ground coffee powder into the powder bowl in the extraction handle, and then scatters the coffee powder evenly in the powder bowl with a powder separator. Use a powder hammer to compact the powder layer, fasten the brewing head of the coffee machine, and press the extraction key.

Because the extraction parameters of espresso are only beans, Qian Jie suggested that the powder-liquid ratio of 1:2 be used to extract espresso. The extraction parameters of Qianjiemen Store are 20g coffee powder and 40g coffee liquid (double espresso), and the extraction time is 23-30s. Then add hot water/ice water according to your own taste according to the ratio of 1:4.5- 1:8.

Coarse ground coffee powder is suitable for drip filter coffee machine.

If it is brewed in a drip pot, that is, an American coffee machine, it is not easy to over-extract if it is coarsely ground, because the hot water outlet of the American coffee machine is like a shower, spraying water on the coffee powder, and the water temperature of the coffee powder of the American coffee machine will be high, and it is easy to over-extract if the grinding degree is fine.