Wash the sweet pumpkin thoroughly and remove the seeds and skin.
Cut the sweet pumpkin into small pieces.
Put water and sweet pumpkin in a pot and bring to a boil.
When the pumpkin is cooked, mash it until smooth.
Strain through a sieve for a silky texture.
Dissolve glutinous rice flour in water, add to the pot and stir.
Simmer over low heat, stirring until it thickens.
Season with salt or sugar to taste.