1. Mix 4 egg yolks, 10 grams of caster sugar, corn oil, and milk.
2. Mix cocoa powder, low powder.
3. Sift the cocoa powder and low powder into the egg yolk and mix well.
4. Add white vinegar and salt to the egg white, add 30 grams of fine sugar in three times, and beat until moist foaming.
5. Take 1/3 of the egg white, add the egg yolk paste, and mix well.
6. Pour the mixed egg yolk paste into the remaining egg whites and mix well.
7. Spread greased paper on the baking tray, pour the mixed cake batter, shake 2 times to remove air bubbles.
8. In the middle of the oven, heat up and down at 175 degrees and bake for 20 minutes.
9. The baked cakes are placed on the baking net to cool down.
10. Add 150 grams of whipped cream and 15 grams of caster sugar, and beat.
11. Turn the cake over and spread the cream.
12. Refrigerate for 1 hour after rolling.
13. Cut into pieces.
Tips:You can also put some fruits in the cream filling to make it richer.
