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Boil 600g baby new potatoes for 15-20 mins. Cool, then halve. Mix together 6 tbsp olive oil, 1 tbsp Dijon mustard, 2 tbsp white wine vinegar, 1 small finely diced red onion, 1 crushed garlic clove, 2 tbsp capers and 1 pack chives, snipped.
Mix potatoes and 2 x 213g cans salmon, flaked into bite-size pieces, with handful watercress. Drizzle over dressing.