1. Juice the purple cabbage, carrot, and spinach separately.
2. Separate the egg whites and yolks. First put the egg yolk, salt, and salad oil in a bowl and beat them evenly. Then, divide them into three bowls and mix them with purple cabbage juice, carrot juice, and spinach juice. Sift into low-gluten flour and mix into three bowls. Egg yolk paste, set aside.
3. Use an electric whisk to break up the egg whites, add lemon juice, add 60 grams of sugar in 3 times, and beat to the point of wet foaming (nine times), that is: the egg white peaks on the whisk are long and not stand upright, inside the basin The protein can be curved and pointed.
4. Divide the egg whites into three bowls of egg yolk paste.
5. Stir evenly with a rubber spatula.
6. Put the batter into three piping bags.
7. Cut a small opening in the piping bag and squeeze it into a diagonal strip pattern in the baking tray. Throw the baking tray on the chopping board several times to remove large bubbles.
8. Preheat the oven at 140 degrees, the upper and middle level, the upper and lower fire, and bake at 130 degrees for 30 minutes (the specific time required depends on the temperature of the own oven).
9. Take out the baking pan from the oven, hold the greased paper on both sides with both hands, take the cake out of the baking tray, place it on the cooling net, carefully peel off the greased paper around, place a piece of greased paper on the other cold net, and buckle the cake upside down on the new greased paper And remove the original greased paper.
10. At the beginning of the cake roll, use a knife to cut 3-4 lines that are not to the bottom, so that the center is not easy to crack when rolling, and the filling is evenly spread on the surface of the cake.
11. Use a rolling pin to roll the cake up with greased paper. After the roll is finished, it can be cut into sections for 10 minutes.
12. Appreciation of the finished picture.
Tips:1. The egg white can only be sent to the level of wet foaming. If it is sent to dry foaming, the protein structure is fine and easy to break when rolled.
2. The baking time and temperature should be set according to your own oven.
