Wave Cake Roll

Ingredients

4 eggs

50g granulated sugar

46g cake flour

32g vegetable oil

40g milk

3g lemon juice

Red bean paste or sweetened red beans

Steps

1. Separate the eggs. Mix vegetable oil and milk until well combined. Add in cake flour, mix until smooth. Add in 4 egg yolks, mix until smooth. Add in some vanilla extract (optional).
2. Add granulated sugar and lemon juice into the egg white, and use a hand mixer to beat until it forms soft peaks. Take a scoop of whipped egg white to mix with the batter until just combined. Pour all the batter back into the whipped egg white, mix until just combined.
3. Put the batter into a piping bag with piping tip. Pipe the batter into the lined baking tray (28*28cm). Preheat the oven to 302℉(150℃) and bake for 26 minutes.
4. Let the cake cool down on the cooling rack first. After that, slice the cake into 4 equal pieces, spread some mayonnaise on the cake and red bean paste as its filling. Roll the cake up and serve.