Trim the red radishes; cut off roots and green leaves. Slice red and white radishes very thin.
Combine vegetables, reserving a small amount of carrot to garnish the salad when served.
Mix sour cream with sugar and salt to taste. Add the vegetables; stir well. Now make a mound of the salad and place on lettuce leaves placed in the salad bowl. Surround with small mounds of carrot. Sprinkle with finely chopped parsley, and dill, if desired. Serve chilled. Enjoy!