Wash the sweet pumpkin thoroughly, remove the skin and seeds, and cut into bite-size pieces.
Place the cut sweet pumpkin into a pot and add water.
Once it starts to boil, reduce to medium heat and cook until the pumpkin becomes soft.
Blend the cooked pumpkin and water in a blender until completely smooth.
Pour the pumpkin puree, milk, salt, and sugar into the pot and bring to a boil again while stirring.
Serve the finished sweet pumpkin porridge in a bowl.