Place all ingredients aside from the yogurt/sourcream/cream, in a large saucepan and simmer till pumpkin and onion are soft. This should take around 35- 40 minutes
Using a stick blender, blitz the soup until it is smooth and lump free.
Add the yogurt/sour cream or cream and blitz again till smooth and blended.
To serve
Garnish with a drizzle of yogurt or sourcream, a few pumpkin seeds and chopped coriander or parsley.
Notes
Top up with additional stock or water if the soup thickens too much.