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Put the fennel in a shallow serving dish and scatter over the apple, spring onions and beetroots. Flake the trout into chunky pieces and arrange on top. Sprinkle with half the dill fronds. Finely chop the remaining fronds and reserve.
Mix the yogurt and horseradish with 1 tbsp cold water, then stir in the reserved dill. Pour half the dressing over the salad and toss very lightly. Spoon over the remaining dressing and serve.