To make a perfect cup of latte, you need to follow the following 4 steps. Grinding: After coffee beans are ground into coffee powder, more than 90% of the aroma will evaporate within two minutes. Many coffee shops will even grind a large amount of coffee powder the night before to prepare for the next day's business, but the best baristas require that the time from grinding to coffee is no more than one minute. Pressing powder: Water will find the fastest shortcut to pass through any place, so when pressing powder, it must be pressed evenly, otherwise the coffee powder in the handle will be high in some places and low in other places. After the water flows in, the density will vary. If they are uneven, it will greatly affect the taste of the coffee. Milk foam: When making latte, the quality of milk is very important, otherwise it will not only affect the taste, but also affect the production of milk foam. While the milk is being frothed, the coffee has already been brewed into the cup, and this process takes 25 seconds. Milk flower: Milk flower is called latte art. When the barista pours milk froth into a coffee cup containing espresso, he uses the direction, angle, and pouring speed of the milk bottle to perform subtle control so that the milk floats from the bottom of the cup to create beautiful patterns. Instead of using a mold . This has very high requirements on the temperature and density of the coffee, the temperature and thickness of the milk, so it is called art.