Peel and wash the carrots and potatoes and cut into large cubes. Peel pumpkin, remove seeds. Coarsely dice the flesh. Peel onion and cut into cubes. Heat oil in a pot and fry onion until transparent.
Add potatoes, carrots and pumpkin. Add 1 litre of water. Stir in the stock and simmer for about 20 minutes. In the meantime, cut bacon into fine strips and drain in a pan.
Puree the soup with the blender. Season to taste with salt, pepper and nutmeg. Wash the chives, dab dry and cut into fine rolls. Pour soup into soup plates. Serve garnished with bacon, pumpkin seeds, chive rolls and crème fraîche.