1. Separate the egg whites and egg yolks. The bowl of egg whites should be water-free and oil-free
2. Egg yolks in a separate bowl
3. Add oil and water to break up
4. Add sugar to beat
5. Add low-gluten flour and sieve
6. Stir in zigzag until there are no particles
7. This state
8. Beat the egg whites with a few drops of vinegar
9. Add a few drops of vinegar to the egg whites and beat them until they become foamy
10. Preheat the oven to 150 degrees (adjust according to your own oven) 1/3 of the egg whites are added to the egg yolk paste and stir evenly
11. Add another 1/3, mix well, and finally pour into the egg whites and mix well
12. Falling down at 10cm, flattening and shaking twice
13. Cut with the knife tilted
14. This angle
15. There is a slope like this
16. Put butter
17. Roll up
18. Finished picture
Tips:The oven temperature must be adjusted according to your own oven
