In a bowl, combine all the vegetables except for the spinach, snow peas, mint, and parsley. Pour the olive oil over them, and season with pepper to taste. Toss to coat.
Spread the oil-coated vegetables over a baking sheet and roast in the oven for 20 to 25 min.
In a bowl, combine all the ingredients for the dressing. Whisk together and season to taste.
Assemble the salad by tossing the cooked vegetables with the spinach, snow peas, mint, and parsley.
Drizzle the dressing over the salad and gently mix.