Peel, wash and chop the potatoes. Peel pumpkin, remove seeds. Cut the flesh into pieces. Peel onion and chop finely. Heat oil in a pot and fry the onion in it.
Add potatoes and pumpkin and fry gently for about 5 minutes, turning. Season with salt and pepper. Deglaze with broth and bring to the boil. Cook on low heat for about 15 minutes. Remove a few potato and pumpkin pieces with a skimmer and put aside.
Puree the soup with a blender. Clean and wash spring onion and cut into rings. Add to the soup and cook for 3-4 minutes. Cut the sausages into slices. Add the potato and pumpkin pieces together with the sausage slices to the soup and warm it up.
Season again and serve sprinkled with thyme.