Peel and finely chop the onion. Fry in hot oil. Add spinach and defrost in a closed pot at low heat. Season with salt and pepper. Add stock and cook the spinach for 5 minutes. Puree with the cutting stick of the hand mixer.
Stir in crème fraiche. Season if necessary. Peel the shavings from the Parmesan with a peeler. Divide the soup between four plates. Spread the salami and parmesan on top