1. Heat the oil in a large saucepan over a medium heat. Add the onion, leeks, fennel, and garlic and cook, stirring frequently, for 5–8 minutes, or until the vegetables are softened but not colored. Add the tomatoes, wine, and tomato paste and stir until blended.

2. Add the stock, bouquet garni, saffron, orange zest, and salt and pepper to taste. Bring to a boil. Reduce the heat, partially cover the pan. Simmer for 30 minutes, or until the soup is reduced slightly, stirring occasionally.

3. To make the rouille, place all ingredients in a food processor and process until smooth. Transfer to a bowl, cover with plastic wrap, and refrigerate until needed.

4. Cut the fish into bite-sized chunks. Remove the orange zest and bouquet garni from the stock, and add the shellfish. Reduce the heat to low and simmer for 3 minutes. Add the fish fillets and simmer for a 2–3 minutes more or until the fish flakes easily. Stir in the Pernod, if using, and season with salt and pepper.

5. To serve, spread each piece of toast with rouille and put 2 slices in the bottom of each bowl. Ladle in the soup,. including a good selection of fish and shellfish.