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To make the dressing. In a small bowl whisk together the ingredients, being quite generous with the salt and pepper.
Wash the lettuce leaves, dry well and keep whole or tear into large pieces. Place in a large mixing bowl and add the radicchio, green onions, radishes and tomatoes.
Just before serving, pour the dressing over the salad and toss gently. Transfer to a large mixing bowl and sprinkle the capers over the top.