What is the reason why there is a layer of ash on the surface of espresso after washing milk?-the method of making espresso

What is the reason why there is a layer of ash on the surface of espresso after washing milk?-the method of making espresso

Acidity [Acidity]: the strong acidity of all coffee grown on the plateau. The sour here is different from bitterness and Sour, and has nothing to do with pH value. It refers to a fresh and lively quality that promotes coffee to exert its functions of invigorating the mind and clearing the taste. The acidity of coffee is not the acidity or sour smell of acidity or alkalinity, nor is it an uncomfortable acid that enters the stomach. When making coffee, the performance of acidity is very important. under good conditions and skills, a special taste with fresh acidity can be developed, which is a necessary condition for high-grade coffee. The sour taste of coffee describes a lively, bright flavor, which is somewhat similar to that used in wine tasting. If the coffee bean lacks acidity, it is equal to lose vitality, taste empty and boring, without layer depth. Acidity has many different characteristics, such as coffee beans from Yemen and Kenya, which have striking fruit aromas and red wine-like texture.

On how to make a good milk bubble, here provides a stupid milk bubble method, that is, pour half of the milk into the steel cup, let the steam pipe and the milk perpendicular to the center or the edge of the steel cup, then let the steam head just touch the surface of the milk, then turn on the steam to 1pm 2, do not move the steel cup, slowly close when the milk reaches 50 degrees, close at 60 degrees, and finally the temperature will reach 66 degrees. In this way, you can make a good cup of foam.

First, as we all know, water is transparent, which allows you to see more clearly how the vortex is formed. The second is to better master the number of holes in the play of different milk bubbles! Third, beginners should remember to use a thermometer when you fail to beat the milk foam into a thin shape, and the temperature cannot be better controlled, so the coffee you make is unstable. You may make milk foam once or twice out of ten times, but that is not a stable quality.

I use my own local method to make milk foam, and it feels good. The appliance is the electric milk beater, 9.9RMB, which is bought by Yijia. Step: add fresh milk to the glass, heat it in the microwave oven for 45 seconds, stir in the milking machine for 1 minute, and the milk foam will become. I use a French press to filter out the 50ml coffee and pour it directly from the top of the foam. I can see that the coffee is gradually mixed with the milk, and the white foam rises slowly.