125g green bean flour (lek tau hoon or lok tau fun)
1 litre water
Tinge of yellow colouring
Tinge of green colouring
To make the syrup: Boil water with pandan leaves. Add sugar to dissolve. Set aside.
Combine green bean flour with water and mix well. Leave aside for 10 minutes. Strain to remove impurities.
Boil litre of water. Add boiled syrup and simmer until water comes to a gentle boil. Pour in green bean flour mixture and stir briskly until mixture turns thick and is crystal clear.
Place two ladles of cooked mixture into two separate bowls. Add different colours to each portion. Leave the remaining mixture plain.
Pour two small ladles of plain mixture into a wet tin (22cm x 15cm). Add a coloured portion followed by a ladle of plain mixture. Mix in another coloured portion and top up with the rest of the mixture.
Use a chopstick to swirl the mixture to create a marble effect. Leave aside to set. Chill well in the refrigerator then cut into diamond shapes.