Heat a large pot of water over medium heat and cook pasta according to package directions. Once cooked, drain, and set aside.
Meanwhile, in a medium bowl, combine all of the ingredients for the dressing and whisk together until well-combined. Add enough water so that the sauce becomes thin and pourable.
Pour the dressing on top of the drained pasta, and then mix in the veggies and remaining ingredients.
Chill at least 30 minutes before serving. This can also be made the night before and refrigerated until ready to eat.