Pumpkin, milk, butter
Remove the skin and seeds from the pumpkin and cut into bite-sized pieces.
Dice the onion.
Put the pumpkin and onion into a pot, add water, and bring to a boil.
When the pumpkin is cooked, blend until smooth.
Transfer back to the pot and season with salt and pepper.
Add milk or soy milk and bring to a boil once more.