In the past, white sugar was used to make cakes that needed to be baked, but later it was discovered that yellow sugar could also be used to make proteins, which were as delicate and soft as baked cakes.And I also recommend yellow sugar, which is not only much more nutritious and micronutrient-rich than white sugar, but also has a very unique sweetness.This time it's golden sugar, which is also more readily available in the country.Eggs with a shell of about 60 g each; grilled plate: three-dimensional 28 x 28 cm gold plate; oil cloth: blue dot blue drop Macaron special glass fiber unstained padThe recipe is based on a recipe written by a teacher from the small island of Yumi.Be sure to check the tips before you start.

WHAT YOU NEED

Ingredients

250 grams of purple potatoes
Purple mashed potatoes: 1 tablespoon of golden sugar
Purple potatoes: water or milk in moderation
Egg yolk: four eggs
Egg yolk: 30 grams of golden sugar
Egg yolk: 2 tablespoons of corn oil
Egg yolk: 2 tablespoons of water or milk
Egg yolk: 80 grams of low-fat flour
Protein cream: four proteins
Protein cream: 40 grams of golden sugar

How TO MADE Simple purple potato cake rolls - how to make the perfect roll

Steps 1 to 4

1. Prepare the grill and prepare the grill pads.

2. Purple potato filling: After steaming the purple potato, peel it, take 250 g of purple potato meat, remove the thicker fibers at both ends, press it into clay with a hot fork, add 1 tablespoon of golden sugar, add water or milk in moderation according to the humidity, mix evenly, use.

3. Egg yolk paste: Egg yolk protein is separated, placed separately in two clean, oil-free, water-free plates, added to the egg yolk with 30 g of golden sugar, stirred with eggs until the sugar dissolves.

4. Add 2 tablespoons of corn oil, stir with eggs until fully emulsified, or you won't see any oil stars.

Steps 5 to 8

5. Then add 2 tablespoons of water or milk and stir evenly.

6. At this time, the oven is preheated, the fire rises to 190 degrees, and the grill is placed in the middle layer.

7. The low-fat flour is sifted into the egg yolk, and the egg is continued to be pressed and stirred irregularly, avoiding rounding up the fat.

8. Until there are no flour lumps.

Steps 9 to 12

9. Protein cream: Open with an electric egg beater, beat at low speed to thick bubbles, add 1/3 sugar.

10. Add 1/3 of the sugar to the mixture.

11. High-speed beating until moist foaming, the final sugar is all added.

12. Continue to beat at high speed until it is almost dry, pull up the head of the egg with a strong small curve, use a rubber scraper to scrape off the protein dots around the egg plate, and then start beating evenly at low speed.

Steps 13 to 16

13. Add the protein cream to the egg yolk paste three times, stirring evenly with force the first time, and lightly and quickly the second and third times.

14. Pour the cake paste into the baking tray and use a razor to smooth it as much as possible.

15. Because this time it's a colored cover, so it's not perfect.

16. Put the middle layer in a preheated oven, turn it up and down 180 degrees, and bake for about 15 minutes.

17. Observe the cake expanding to its highest point, and there is a slight retreat, and the cake is baked when it starts to come out of the mold.

18. After baking, remove the whole plate, place the drying rack side by side with the baking tray, gently pull the cake slices from the raised side of the baking pad, move them flat onto the drying rack until completely cooled.

19. Lay a large film on the table, flip the cake over, tear off the baking pad, and carefully flip it over.

20. Note that the purple side is the one with the purple filling.

21. Start by applying the purple potato filling from the side near you, leaving about 5 cm unfilled.

22. From close to your side, lift the preservative film to the position of 1/3 of the cake slice, hold the cake in a circle and a half, wrap the preservative film tightly around the cake roll, put it in the preservative box, refrigerate for more than half an hour, and after typing, you can take out the slices.

23.