Yam layer cake

Ingredients

• ingredients A
• 4 egg yolks
• 80 ml water
• 70 g caster sugar
• 1/2 tsp salt
• 120 g super fine flour
• 11/2 tsp baking powder
• 1/2 tsp vanilla essence
• 1/2 cup corn oil
• ingredients B
• 4 egg whites
• 1/2 tsp cream of tartar
• 70 g caster sugar
• 350 g yam
• 70 g caster sugar
• 1/8 tsp salt
• 11/2 tbsp agar-agar powder
• 85 g Hoen Kwe flour
• 2 coconut to make enough coconut milk
• 300 g whipping cream
• Some fondant flowers and leaves