Double-skin milk 1, boil the milk pot and pour it into a large bowl, and you can see a wrinkled skin on the surface of the milk. 2. Put two egg whites and two spoonfuls of sugar in an empty bowl and mix well until the sugar dissolves. 3. After it is slightly cool, pierce the milk skin with chopsticks, then slowly pour the milk into the big bowl with egg white, stir it evenly, and slowly pour it back to the big bowl with milk skin along the edge of the bowl, and the milk skin will float by itself. 4, steam for ten minutes.