Peel and dice the parsley roots. Chop the onion, sauté in 1 tablespoon hot oil. Add the diced vegetables, pour in the stock and simmer for approx. 25 minutes. Puree. Add the cream and milk, let the soup get hot again (do not boil!). Season with salt, pepper and a little nutmeg.
Grind the parsley leaves, salt and oil into a pesto. Roast pine nuts in a coated pan without fat and pour over the soup with the pesto.