Peel and finely chop the onion. Clean broccoli, cut into florets and wash. Fry onion and broccoli in hot oil. Season with salt and pepper, add broth and cook for about 10 minutes.
Take out some broccoli florets with a skimmer, puree the rest in the broth with the cutting stick of the hand mixer. Stir in crème fraiche and season if necessary. Add the broccoli florets again. Spread on two soup plates, sprinkle with crouttinos