Ingredients:
– Egg whites: 400g
4. Prepare strawberry jam, orange jam, and cocoa powder.
5. Take a small amount of batter and mix it separately with strawberry jam, orange jam, and cocoa powder to create three different colors. 6. Fill a piping bag and pipe plum blossom patterns onto the baking tray. 7. Pipe a thin layer of cake batter over the patterns. 8. Place in the oven at 190°C for about 10 minutes, then remove. 9. Invert onto parchment paper to cool slightly, revealing the plum blossom patterns. 10. Invert again so the patterned side faces down, spread with orange jam, and roll up from one side. 11. The rolled cake roll. 12. Slice the cake roll into individual pieces according to the patterns.

