Kitchen note from
Jane: The batter should be thick enough to form soft peaks when you draw up your whisk. To test it, you can write a letter "O" on the surface of batter and it should stay there for few seconds. (Thank you Jane for all the useful tips) ♥
The wooden mould is available online
here
My Matcha Marble Castella Cake 抹茶斑马线长崎蛋糕