New year's first challenge: Magic Cake

I've decided to take up the baking challenge by making the most talked about Magic Cake. 

Magic Cake (Gâteau magique à la vanille in French) is a cake with just one batter and you can get three layers with different textures: sponge cake, custard cream and soft fudge. 

I've read from the web that many people found it very difficult make it successfully. I am lucky enough to be successful in this first trials. I think the tips lie on amount of the batter and the size of the cake mould, and it is very important not to mix the batter too even. 

Cake done and took out from oven

Magic cake put into fridge overnight

Cut-opened view of the cake and the 3 layers are visible

Sprinkle with icing sugar

Ingredients
(8-inch cake mould)

1. Unsalted butter 98g
2. Vanilla extract 1 tsp
3. Eggs 3 pcs
4. Cane sugar 118g
5. Cake flour 90g
6. Water 11ml
7. Milk 395ml
8. Salt just a pinch

Method

1. Preheat the oven at 150 Celsius.
2. Melt the butter by steaming in wok/in a pot with direct heat/microwave and leave for cool.
3. Warm the milk (lukewarm will be fine).
4. Separate the eggs into egg yolk and egg white. Add water and sugar to the yolks and beat them till the mixture turn into light yellow cream.
5. Then mix each of the followings into the cream one by one: melted butter, vanilla extract, cake flour, salt and milk.
6. Whisk the egg white into foam with soft peak using electric mixer. Separate the foam into 3 portions and mix with the batter gently. No need to mix it too even. It will be fine to have some lumps.
7. Pour the batter into the mould and bake for around 50 minutes.
8. When the cake is done, cool it in the rack and put it into the fridge for at least 3 hours or overnight. Sprinkle with icing sugar when serve.

Bon appétite!