Preheat grill to medium. In medium bowl, blend sour cream, vinegar, sugar, marjoram and salt and pepper to taste; set aside. Spray kohlrabi with nonstick cooking spray. Place kohlrabi on grill. Grill covered 10 minutes or until tender, turning once. Remove and allow to cool slightly.
Add peach, carrot and green onions to dressing mixture; toss lightly. Coarsely chop kohlrabi; add to peach mixture and toss. Serve immediately or cover and chill until serving.
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