Preheat oven to 350°F. Line the round pan with banana leaf. Grease generously with margarine, set aside.
In a medium-size bowl, add thawed grated cassava,1/4 granulated sugar, beaten egg yolks, coconut milk, and vanilla. Mix until well combined.
In a separate bowl, whip egg whites add 1/4 sugar gradually and whip into soft peaks. Add and fold into the cassava mixture. Mix just until combined.
Pour the mixture in the prepared pan. Bake for 30 to 35 minutes or until the top is no longer wet.
Remove from the oven and pour the yema topping ingredients, condensed milk with egg yolk.
Bake for an additional 20 to 23 minutes until the top turn golden brown. Let it cool before slicing.