Put the fresh milk in the pot. Heat the milk slowly, and soon a piece of milk skin will form on the top of the milk, that is, turn off the heat, carefully pick up the skin and don't break it. After catching cold, the milk skin will harden. After it is fished out, the milk will be heated and turned into milk skin again. Pick up the skin and repeat it many times until the milk is salty. Eat milk with jam or raspberries.

The ancient book Raspberry said that it can "delight the skin and benefit the color", so raspberries and milk cakes can complement each other when eaten together. In addition, the milk left by the milk skin can be used to wash your face, which is also beneficial to beauty.