Wash the pumpkin thoroughly, remove the seeds, and cut it into cubes.
Thinly slice the onion.
Heat olive oil in a pot and sauté the onions.
Add the pumpkin and stir-fry together.
Pour in enough water to cover the ingredients and bring to a boil.
When the pumpkin becomes soft, blend it smoothly using a hand blender.
Season with salt and pepper to taste.