Clean and wash spring onions and celery. Cut into rings or slices. Peel and finely dice onion and garlic. Clean, wash and chop the peppers. Heat oil in a pot. Fry everything in it while turning. Pour wine
Add the tomatoes with the juice to the vegetables and crush them a little. Wash the herbs, shake dry and chop finely. Grind the fennel seeds with a kitchen roll. Add everything to the vegetables. Season with salt and pepper. Simmer for about 10 minutes.
In the meantime, wash all the mussels under cold running water, brushing them thoroughly. Throw away open mussels. Wash the fish fillets, dab dry and cut into cubes of approx. 3 cm. Wash the prawns (peel as desired) and dab dry.
Add mussels, fish pieces and prawns to the vegetables. Let everything cook for another 8 minutes. Season to taste with salt and pepper and arrange in a large tureen. Garnish with basil leaves as desired