Prepare (slice and dice) vegetables (except broccoli) as directed above. Place in large container with tight lid. Add vinegar, dressing, and pepper; cover and shake. Boil rotini to desired tenderness in heavily salted water. When rotini has less than 2 minutes to cook, add broccoli florets to blanch and finish rotini cooking time. Drain rotini and broccoli and rinse under cold water. Add to container of vegetables and shake well. Refrigerate before serving. 24 hours is best. The longer it sits in fridge, the better the flavor.