Peel, wash and roughly dice the potatoes. Clean broccoli, peel stems. Wash and chop both. Peel and chop onions.
Fry the onions and potatoes in hot oil. Add broccoli. Season with salt and pepper. Add about 2 l water, stir in broth and bring everything to the boil. Then simmer covered for 15-20 minutes.
Cut the sausage into diagonally thin slices and fry them crisply in a pan without fat. Drain on kitchen paper. Finely puree the soup.
and refine with cream. Season to taste. Serve the broccoli soup. Garnish with chorizo chips and chervil.