Place the turkey, prosciutto, havarti, cucumber, mushrooms, radicchio and tomatoes in a large mixing bowl.
In a separate mixing bowl, whisk together the mustard, horseradish sauce and vinegar. Slowly drizzle in the olive oil, whisking constantly to form an emulsion.
Gently whisk in the fresh herbs, salt and pepper. Pour the dressing over the salad and toss gently to combine.
Use individual leaves of the radicchio to form a bowl and fill with the salad.
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