Cut the onion into small pieces. Hollow out the pumpkin and dice it. Peel and cut the carrots and sweet potato.
Sweat the onion in olive oil. Add the pumpkin and fry it. Deglaze with broth. Add the sweet potato and carrots. Simmer on medium heat until the vegetables are tender.
Puree the soup, season to taste and stir in the Cremefine.