1.Heat oil in a large saucepan on medium. Cook onion and celery for 5 minutes, until softened. Add garlic, fennel seeds and chilli, stirring for 1 minute, until fragrant.
2.Add chopped tomato, saffron threads, fish stock and 2 cups water. Bring to boil, then reduce heat and simmer for 10 minutes. Season to taste.
3.Add seafood, cover and simmer for 5 minutes, until prawns are pink and mussels are open. Scatter with parsley and serve with crusty bread.