Prepare silken tofu
Cut the tofu into cubes or scoop it into bowls
Make arnibal by boiling brown sugar and water
Add pandan leaves if desired
Simmer until slightly thickened
Prepare sago or tapioca pearls if using
Cook the pearls until soft and translucent
Drain the pearls
Spoon warm tofu into cups or bowls
Add cooked sago or tapioca pearls
Pour warm arnibal over the tofu
Serve immediately