Cooking Steps

1. 

   Step1:Mix sugar and salad oil. Beat with a hand beater until sugar melts. Then add the yolk and stir until the yolk turns white. Then add milk and mix evenly. Finally, mix cocoa powder, low gluten flour and baking powder and sift them. Stir evenl

2. 

   Step2:Whisk the egg white with sugar three times. Add white vinegar in the middle of the way. Beat until it is dry and foamy

3. 

   Step3:Preheat the oven about 165 degrees

4. 

   Step4:Mix the egg yolk batter mixed in step 1 and the albumen beaten in step 2 evenly. Knock out the bubbles. Bake in the middle and lower layers of the oven for about 35 minutes.