In a bowl, mix the grated sago or sago flour with water and salt. Stir until well combined.
Add the coconut milk and sugar (if using). Mix until you have a smooth batter.
If using banana leaves, cut them into squares and lightly steam or blanch them to make them pliable. Alternatively, you can use parchment paper.
Spoon a portion of the sago mixture onto the center of each banana leaf or parchment paper square.
Fold the edges of the leaf or paper to form a secure package, wrapping it tightly to seal the mixture inside.
Steam the wrapped sago in a steamer or a large pot with a steaming rack for about 30-40 minutes, or until the sago is fully cooked and has a pudding-like consistency.
Allow the Saksak to cool slightly before unwrapping.
Enjoy your meal!