Ingredients
- 1 tbsp sherry or red wine vinegar
- 1 tsp Dijon mustard
- 3 tbsp extra-virgin olive oil
- 2 medium potato, such as Maris Piper or Desirée, cut into cubes
- ½ small red onion, thinly sliced
- 1 large orange
- 100g bag watercress
- 2 peppered smoked mackerel fillets, skin removed
Method
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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.
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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.