1. The egg white and yolk are separated.
2. Put the egg whites and sugar into the blender and beat them quickly.
3. Then squeeze the juice of half a lemon and the flour and stir gently.
4. Prepare strawberry jam, orange jam, and cocoa powder.
5. Take a little batter and mix with strawberry jam, orange jam, and cocoa powder to make three colors.
6. Put it into a piping bag and squeeze out the plum blossom pattern in the baking tray.
7. Squeeze a thin cake batter on the pattern.
8. Put it in the oven at 190℃ and take it out in about 10 minutes.
9. Hang it on the oil paper for a while, and you can see the plum blossom pattern.
10. Turn it back again, with the patterned side facing down, apply orange marmalade, and roll it up from one side.
11. Rolled cake rolls.
12. Cut the cake roll into pieces according to the drawing pattern.
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