How to adjust the temperature of milk foam

How to adjust the foam temperature of the Italian coffee grinder

When the coffee bean enters the grinder, the blade in the grinder will crush the coffee bean into powder. The smaller the distance between the blade and the blade, the smaller the coffee beans will be ground into smaller particles. The finer the grinding particles are, the tighter they are, and the more difficult it is for the water to pass through, thus greatly prolonging the extraction time.

On the contrary, if the distance between the blades increases, the ground particles will become rougher, the flow of water will be easier to pass through, and the extraction time will be faster.

To take a simple example, like stones and fine sand, water flows much faster through stones than fine sand, because there is more space between the stones for the flow of water to pass quickly. Therefore, the correct grinding is very important, and the particle size directly affects the quality of the extraction.

If there is an obvious astringent taste or excessive extraction, it may be fine or slow, you can try to make it thicker, but because there are too many variables, you can only move one variable each time you adjust it. That is, when there is an extraction, you adjust the technique, the speed of water injection, the number of circles, the size of the water column, the thickness of the powder, the temperature and so on, but you can only change one. If it is more obvious miscellaneous bitterness, you can first consider the thickness of the powder.