Put black and
white glutinous rice in pot with water and pandan leaves. Bring to boil.
Lower heat, remove pandan leaves then simmer for 45 minutes till liquid
is thickened. Add sugar and simmer for 10 minutes. Add salt. Mix tapioca
flour with water. Stir mixture into pot to thicken. Remove black
glutinous rice porridge from heat and transfer into bowls. Drizzle with
thick coconut milk on top before serving.