Sauté shallots and fennel in the butter. Sprinkle with curry and saffron. Extinguish with Noilly Prat and white wine, cook a little. Add fish stock and boil to half.
Add ready-to-cook mussels to the broth form. Cook for 7-8 minutes in closed pot until all mussels are open. Remove the mussels, discard those that are still closed. Simmer the stock for another 5 minutes. Mix in whipped cream and crème fraîche.
Beat in cold butter with a hand mixer. Strain through a sieve. Season with cayenne pepper and salt. Mussels again in the broth form. Dressing: Place mussels in deep plates and garnish with parsley. Serve immediately