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Mix together the lemon juice, mayonnaise, a little of the dill and some seasoning, then spoon into a ramekin. In a large bowl, mix together the remaining dill, fennel and cucumber, season, then drizzle over the vinegar and oil.
Put the watercress on 2 plates and top with the fennel salad. Flake the salmon on the side and serve with the lemon mayo.
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