1, Boil 300g sweet potato till fully cooked.
2, Remove the peel and cut into small pieces.
3, Add them into blender with 200ml coconut milk. Blend till smooth.
4, Add paste into a bowl. Add in 2/3 cup tapioca flour, 1/2 cup corn flour, 100 ml water and 1 pinch salt. Whisk well.
5, Boil 300ml water with 1/2 cup sugar till sugar fully dissolved.
6, Add sugar water into the paste. Stir well.
7, Grease cake pan with oil. Pour paste into the pan. Steam over hot water for 15 mins.
8, In a bowl, mix 200g grated coconut with 1 pinch salt. Steam for 5 mins.
9, Cut steamed cake into smaller pieces and roll in coconut flakes.