In the meantime, season the mince with salt, pepper and paprika, shape into balls and fry in 2 tablespoons of olive oil.
Take about 1/3 of the potato and leek mixture with a slotted spoon, keep warm and remove the thyme. Season the soup with salt, pepper and nutmeg and puree with the cream.
Serve the soup garnished with the skimmed potato and leek mixture, the meatballs and the remaining thyme.