Put carrots and 1/4 cup ... mixtures. Stir in mushrooms and zucchini. Cover and chill ... pepper. Pour over salad and toss. Cover and chill for 2 hours.
Cut up vegetables into bite-size pieces. Mix vegetables and pasta together. Marinate vegetables and pasta ... dressing, stirring every couple of hours.
Cook pasta as directed on package, adding ... scallions. Toss to mix. Refrigerate 30 minutes before serving. Sprinkle with walnuts just before serving.