Exercise:
Add white vinegar to 1 4 egg white, stir with electric egg beater, and pour the mixed egg white and corn starch several times along the edge of the basin until it is dry and bubbly (I try it with chopsticks every time, but the chopsticks don't fall off).
2. Stir four egg yolks, milk and oil with electric egg beater first, then pour in low flour and mix well.
3. Pour the egg whites into the egg yolk paste several times and stir well.
4. Pour it into a baking tray covered with oiled paper.
5. Middle layer of oven, 150 degrees for 30 minutes.
6. Take it out of the oven and put it back.
7. Tear off the oiled paper and cut it into pieces.