Peel the onions and finely dice them. Wash, peel and cut the parsley roots and potatoes into two centimeter cubes.
Sauté the onions, parsley roots and potatoes in a saucepan in olive oil. Pour in the broth and cook for 30 minutes. Puree the soup finely with a hand blender, add the cream, bring to the boil again briefly and season with salt, nutmeg, pepper and thyme.
Cut the pork belly into fine strips and fry them in a pan until crispy.
Put the soup in soup bowls and sprinkle with the bacon.