Trim 1/2 inch from bottom of broccoli stem. Cut broccoli lengthwise into 4 pieces.
Bring salt and 2 qt. water to a boil in a Dutch oven over high heat. Add broccoli, and cook 2 minutes or just until broccoli turns bright green. (Do not overcook.) Drain broccoli, and plunge into ice water to stop the cooking process. Let stand 1 to 2 minutes. Drain broccoli, and pat dry between paper towels. Chop broccoli florets and stems.
Combine broccoli, green cabbage, and next 6 ingredients in a large bowl. Add 1 cup Mayo-Sour Cream Dressing, and toss to coat. Cover and chill 8 to 24 hours. Add additional dressing, if desired.
Make-Ahead Tip: Make this easy and delicious winter salad 8 to 24 hours ahead to allow the flavors to meld.