Make the dressing ahead and chill it in the refrigerator, but add the herbs just before tossing the salad.
To prepare dressing, combine first 10 ingredients, stirring well with a whisk.
To prepare salad, combine the salad greens, cabbage, tomatoes, and onions in a large bowl. Drizzle dressing mixture over salad mixture; toss gently to coat. Serve immediately.
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