Birthday Cake for my sis

Ingredients for Sponge cake:
4 eggs
100 gm cake flour
100 gm castor sugar
12 gm spongecake stabliser
25 gm milk
90 gm melted butter

Yam Fillings:

500 gm. Yam - steam and mashed into puree
100 gm. sugar
300 gm. coconut milk
100 gm. whipped cream

Methods:

To make sponge cake:
Put all the ingredients except the melted butter into a mixing bowl.
Beat everything on high for at least 7 mins until ribbon stage. This means that if you use your whisk with batter to write an "8" on the batter won't sink in but will appear visible for a while. This will be the right constitency for your batter. Add in melted butter at this stage and mix in thoroughly.

Pour batter into 8" round pan and bake it in a preheated oven at 190C for about 35 mins. When done, remove the cake from the cup immediately and leave it on wire rack to cool.

To make filling:
1. sugar over medium heat till sugar is dissolved. Add in yam puree, coconut milk. Stir till almost dry. Leave to cool.
2. Place 1 layer of sponge cake onto a cake board.
3. Spread 300 gm. yam mixture on top and spread till evenly distributed.
4. Cover the yam mixture with a layer of sponge cake.
5. Spread cake with 100 gm. of whipped cream.
6. Cover with the 3rd layer of sponge cake.
7. Deco with whipped creams n fruits.
8. Chill in fridge.