2. Separation of egg yolk protein. Beat the egg whites into an oil-free and waterless container, pour the egg yolks into the container, and add 20 grams of sugar to break up.
3. Add 2 drops of white vinegar to the egg white, 20 grams of white sugar in three times, and add it when fish blisters appear for the first time; Add the second time when the protein has fine lines; Adding the hard protein from sugar for the third time just lifted the corner of the eggbeater that didn't disappear.
4. Mix the beaten protein into the protein for three times and stir it up and down to avoid defoaming.
5. Put the prepared batter into a mold, preheat it in an air frying pan at 140 degrees for three minutes, then put it into a cake mold, bake it at 140 degrees for 20 minutes, and bake it at 170 degrees 12 minutes.
6. The baked cake is decorated with some milk powder.