Heat 2 tablespoons of oil in a saucepan. Cut the onions into strips and sauté. Press the garlic through the garlic press and add. Add tomato pieces and spices and sauté everything for 5 minutes over medium heat. Add fish stock and wine and let simmer in the pot for another 5 minutes over medium heat.
Add the pieces of fish, prawns and mussels, bring to the boil briefly and then simmer over a low heat for 5 minutes.
Season the soup with salt and pepper and sprinkle with chopped parsley.
Roast the bread slices and distribute them on the plates. Pour the hot soup over it.