Put sweet potatoes and yam into a steaming tray and steam with high heat for 20 minutes until soft.
2
Colourful starch: Put 50g tapioca flour and pinch of salt into a mixing bowl, pour in 2 tbs boiling water and stir well. Cover and leave aside for 15 minutes. Mix and knead into a non-stick dough. Divide into 3 portions, Mix 1 portion with red colouring, 1 portion with yellow and 1 portion green. Roll into long thin sausage shape and dice into cubes.
Bring 1/2 pot of water into boil, put in starch cubes and cook until they immerse onto the surface. Drain and keep cooked starch in ice cold water for 10 minutes or until needed. Drain starch.
3
Put remaining ingredients into a clean pot, stir and bring to boil. Add sweet potatoes, yam and starch cubes. Mix well and taste.
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Serve hot or cold as snack or dessert. Adjust sugar amount as your preferences.