How to make flour part
1. Preheat the oven before baking at 180 degrees Celsius. The top + bottom heat, do not turn on the fan for 20 minutes.
2. Put the egg yolks into a mixing bowl, add 1 egg, add milk to the bowl, beat together, then add vegetable oil and beat together. Sift the cake flour and cocoa powder into the bowl. Then beat together again and set aside
3. Put the egg white into the mixing bowl. Fill the vanilla scent Beaten up to a coarse bubble, add salt and a half of sugar, beat to dissolve sugar. Then add the remaining sugar and beat until the egg whites are creamy.
4. Divide the Meringue 1/3 into the flour bowl and stir together gently. Then put the ingredients from the flour bowl back into the Meringue bowl. And stir together gently.
5. Pour all ingredients into the tray, covered with baking paper, higher than 1 tray.
6. Lift the pastry tray into the baking tray.
7. Add water to the baking tray. Give water volume 1 cm high
8. Bake at 180 degrees Celsius for 50 minutes or until the cake is cooked. Use top + bottom heat. Turn off the fan.