Smoked mackerel with orange, watercress & potato salad

Method

• step 1

  Whisk together the sherry or wine vinegar, mustard and oil with some seasoning. Boil the potatoes in salted water until easily pierced with a knife, about 10 mins. Toss in a bowl with threequarters of the dressing and onion slices, then leave to cool a little.

• step 2

  Cut the peel and pith from the orange, then cut into thick slices. Toss the watercress into the salad, then divide between 2 plates and top with the oranges, fish and the remaining dressing.