Zest your lemons before juicing them, and transfer the zest to a blender. Add the lemon juice followed by all of the other ingredients for the dressing to the blender. Blend until all of the ingredients are thoroughly mixed and pureed into a dressing. Give it a taste test and season further if needed.
Drizzle half of the dressing over the orzo and toss to coat. Give it a taste. If you think it needs more, drizzle a little bit more dressing over the orzo until you're satisfied with the flavor. Save any extra dressing in a sealed container for future use. (You can drizzle it over any leftovers to revive the salad after it being refrigerated.)
Finally, toss the roasted zucchini in with the orzo, followed by 1/2 cup chopped red onion, 4 oz of crumbled feta, 1/3 cup toasted pine nuts, and some extra chopped fresh herbs. Give everything a toss and serve, or place it in the fridge until serving time.
The salad and any leftover dressing will last in the fridge for 3-5 days.