In a small bowl, whisk together all the ingredients for the vinaigrette. Season the vinaigrette with salt and pepper and set it aside.
In a large bowl. combine all of the vegetables and gently toss together. Pour the Greek vinaigrette over the vegetables, and again, gently toss to coat them. Crumble the feta over the salad and then very gently toss the cheese into the vegetables.
Taste and adjust for more freshly ground black pepper if desired. Serve immediately at room temperature, or chill before serving.