Melt the butter. Use microwave or put the butter in a bowl and set it on a bowl of hot water. Do no let it boil. Set aside to let it cool.
In a bowl, put in the egg yolks, milk, and melted butter.
Sieve the flour into the bowl.
Add pandan extract.
Mix well using a whisk. Set aside.
In a separate bowl, beat the egg whites using a hand mixer.
Put in the sugar in 3 parts.
Put in the lemon juice. Beat the egg whites until soft peak is reached. Check the video.
Take some of the meringue into the pandan batter. Mix well using a whisk. And pour back to the meringue bowl and mix it well.
Mix well. Put the batter into a piping bag. Set aside.
Pour the whole pandan batter into the pan.Do not forget to line up the pan with parchment paper.
Bake in a preheated oven at 150°C for 60 - 70 minutes. Put a pan with water at the bottom of the oven.
Take out the cake from the oven. Gently pull the cake from the baking pan. Peel the parchment paper carefully. Let it cool completely. Slice them and enjoy!
Video
Notes
Remember to line up the baking pan, the bottom and the sides. The height of the parchment paper at the sides can be higher than the pan. This is to help remove the cake from the pan after it is baked.
When beating the egg whites, you know it is soft peak when it forms a hook at the end.
Always check the oven to prevent the top burning too dark.