1. To make white sauce, melt butter in heavy based saucepan. Add flour and mix until it becomes a paste. Cook out for 2-3 minutes.
2. Gradually pour in hot milk and whisk until smooth. Remove from heat and set aside.
3. Heat the oil in a pan, sauté vegetables until soft.
4. Add marinara mix and simmer for 4-5 minutes. Pour in your white sauce, fish stock and fish sauce. Season with salt, pepper and lemon pepper. Bring gently to the boil.
5. Add in white fish and cream. Simmer for 8-10 minutes or until fish is cooked through.
6. Taste and correct seasoning.

To serve: Sprinkle in freshly chopped parsley. Serve in a deep bowl with fresh crusty bread and butter.