Wash the kabocha thoroughly, remove the seeds, and cut it into pieces.
Place the kabocha in a steamer and steam until fully cooked.
Peel off the skin and mash the flesh of the kabocha.
In a pot, add the mashed kabocha and water, then bring to a boil over medium heat.
Once it thickens to your liking, season with salt.
Serve in a bowl to finish.