Sewin with Samphire and Watercress Mayonnaise

Wash the sewin under running water and dry with some kitchen paper. Season the cavity of the fish with some salt, and then put the slices from half a lemon and some fresh tarragon in the cavity.

Brush the outside of the sewin with olive oil and then season lightly with salt, and sprinkle over some fresh lemon juice. Lay out the foil and brush with olive oil, lay the sewin on top and wrap the foil around the fish folding in the head and tail ends.

Make some fresh mayonnaise using good olive oil and organic eggs  Recipe  . Wash the watercress, use scissors to cut off a couple of handfuls of leaves, and then finely chop to produce two tablespoonfuls. Stir into the mayonnaise  Picture  .

Peel the cucumber and cut into very fine slices using a mandoline if you have one. Make some dressing with two or three tablespoonfuls of olive oil, half a tablespoonful of lemon juice, and a half a teaspoonful of salt. Toss the cucumber in the dressing  Picture  .

Wash the samphire under running cold water, and trim off any brown ends and get ready for steaming  Picture  , note no salt is required.

Cook the sewin in foil in the oven at 350°F/180°C/Reg4 for about 45 minutes (or with a smaller fish 10 minutes per 1lb/500 gms plus a minute or so). Take out when done and leave in the foil for about half an hour or so.

Meanwhile, boil the potatoes and drain. Chop the mint and add along with some butter to the potatoes stir and cover. Steam the samphire for two or three minutes and then keep covered.

Unwrap the sewin  Picture  . Cut off the head, and tail and gently remove the skin from one side. Use a knife to ease the fillets from the backbone and keep to one side. Discard the backbone, turn the other half of the fish and remove the skin.

Cut the sewin fillets into serving pieces and put on the serving plates, along with the potatoes, cucumber, samphire and a spoonful of mayonnaise  Zoom  .