1. Separate the yolk from the egg whites. Protein's bowls need no oil and no water.

2. Mix egg yolk with fine sugar and beat well with an egg beater. Add salad oil (or odorless vegetable oil such as sunflower oil) in three times. Beat with an egg beater until mixed evenly each time, and then add it. Add water (or milk) and gently stir well.

3. Sift the low-gluten flour into the egg yolk. Stir well with a rubber spatula to form egg yolk batter. Set aside the mixed egg yolk batter.

4. Start to send protein. Add sugar at one time, first at low speed and then at high speed, and send the protein to wet foaming state (after the eggbeater is lifted, the protein is pulled out of the curved sharp corner).

5. Put 1/3 egg white into the egg yolk bowl and stir evenly (from bottom to top, don't stir in circles). Add 1/3 egg white into the egg yolk bowl and stir well. Pour the batter into the remaining egg whites. Stir well again.

6. Pour the batter into a baking tray covered with tin foil or oiled paper, smooth it, and shake it hard a few times to let the big bubble flow in the batter come out. Put the baking tray in a preheated oven at 180℃ and bake for 15 minutes until the surface is golden yellow.

7. Wash and chop strawberries.

8. Cream 100g, add sugar 10g and beat with electric egg beater until hard.

9. Prepare a new tin foil or oiled paper, pour the cake on it, and tear off the tin foil or oiled paper on the cake while it is hot. At this time, the bottom of the cake is facing up.

10. After the cake cools a little, turn the cake over so that the surface faces up again.

1 1. Spread a layer of whipped cream on the surface of the cake, and then sprinkle with strawberry granules.

12. On the side to be rolled up, pull a knife first, but don't cut it off. It's more convenient to roll like this.

13. Roll it from the cut end to the back, and cut off the back edge to look neat.

14. Finally, wrap the rolled cake roll with tin foil or oil paper, and twist both ends into candy. Put it in the refrigerator for half an hour to set, and you can cut it delicious.