Cut the pumpkin into slices, remove the seeds. Peel and dice pumpkin. Peel and chop onions. Heat oil in a pot, fry onions and pumpkin. Deglaze with broth, bring to the boil and simmer for about 20 minutes.
Meanwhile wash parsley, shake dry and cut into fine strips. Puree the soup and season to taste with salt, pepper, nutmeg and vinegar. Arrange in soup bowls sprinkled with parsley. Roasted baguette slices taste good with it.