1. Egg yolk, milk, part of sugar, oil, put them together, and stir well with egg
2. Sift in low powder
3. Whisk the egg to the left and right to stir evenly, set aside
4. Egg whites and the remaining sugar, hit 8 to distribute, the tip stands upside down but will fall
5. Mix the egg yolk paste and egg white paste twice
6. Mix well and set aside for later use
7. Cocoa powder add a little batter and mix well
8. First draw a little bit on the tarp, put it in the 170 degree oven for 1 minute, and the surface will crust.
9. Add some batter to the rest of the chocolate paste to make a lighter batter than the one just now, paint on the side, 170 degrees for 1 minute, and the surface will be crusted.
10. Pour the remaining raw color batter into the oven just now, pat it flat, bake at 170 degrees for 15 minutes, and set aside
11. Mashed bananas
12. Add eggs, cornstarch and mix well, then add milk and mix well
13. Put it on a small fire and heat it slowly until it solidifies, put ice water to cool down, cover with plastic wrap and put it in the refrigerator for later use
14. Cake slice cut into 4 slices
15. Put banana custard in the middle, roll it up, and wrap it tightly with plastic wrap
Tips:Banana custard put a little less, I put one too much, it becomes a fat banana, haha
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