To make the dressing, whisk together the vinegar, mustard, sugar and a quarter of a teaspoon of salt. Whisk in the olive oil, followed by the lemon zest and the Worcestershire sauce, if you are using it, and finally the capers.
Arrange the lettuce leaves in a bowl. Slice the radishes and add those.
Rub the spring onion slices between your fingers to separate the rings and put them in too. Tip over the dressing and toss the salad well. Sprinkle over the dill and serve straightaway.
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