method
1. Place the fish in the centre of a large piece of foil. Add 30 ml (2 tbsp) of the lemon juice, then dot with 25 g (1 oz) of the butter. Season to taste.
2. Seal the foil, weigh the fish and place on a baking sheet. Calculate the cooking time at 10 minutes per 450 g (1 lb). Bake at 180°C (350°F) mark 4 until tender.
3. Remove the fish from the foil, reserving the cooking liquor, then carefully remove the skin while still warm. Arrange the fish on a serving dish and leave to cool.
4. To make the sauce, put the cooking liquor and the remaining 25 g (1 oz) butter in a saucepan and heat gently. Add the watercress, spinach, parsley, chervil and dill, then cook for 2-3 minutes, until softened.
5. Put the sauce in a food processor or blender and work until smooth. Transfer to a bowl and add the remaining lemon juice and season to taste. Leave to cool, then fold in the mayonnaise. Turn into a small serving bowl and refrigerate until required.
6. When the fish is cold, garnish with fresh herbs and whole prawns, if liked. Serve with the herb sauce.
serving amount
serves 4
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