1. Cut the zucchini lengthwise in “planks” and coat lightly with oil. Grill all pieces on both sides. Remove from grill and dice.
2. Coat the corn lightly with oil and grill, turning until done. Allow to cool, and cut off the kernels into a bowl. Add zucchini and rest of vegetables. Mix well.
3. In a small bowl, combine dressing ingredients and mix well. Pour over veggies and toss to coat.