1. Shell the eggs, pour them into the mixing bucket, and add sugar.
2. Add custard powder and stir for 2 minutes.
3. Add the flour and cake oil and continue to stir for 2 minutes.
4. After the flour is evenly mixed, stir quickly for 5 minutes, add olive oil, melted butter, and milk slowly and stir evenly.
5. Cocoa powder is added to cold water to make a paste.
6. Sweep the baking sheet with oil pad paper.
7. Pour the prepared cocoa powder paste into the mixing bucket, and stir it for a few occasions. Don't mix the two too evenly, so as to avoid the pattern.
8. Pour into the baking tray, scrape it flat, bake in the oven for about 30 minutes, tap lightly with your hands, if it is elastic, it will be cooked thoroughly, and let it cool off the oven. When roasting, the heat is 200 degrees and the heat is 180 degrees.
9. After it has cooled down, cut the cake into slices. According to your senses, you can also reduce the amount of cocoa powder so that the color is not so dark.
