Brill Poached in Red Wine/Salsify & Sea Vegetables

To make the sauce

Pour the red wine into a pan with the cinnamon, cloves and citrus zests. Bring to the boil and simmer and reduce by two thirds until a syrupy consistency is reached: add the fish stock, reduce by half again and take off the heat.

Pass through a sieve into another pan, bring to the boil again and reduce by half until the sauce is th