Preheat the oven to 400 F. Line a large baking sheet with parchment paper and set aside.
Make the pesto. In a food processor fitted with the “S” blade, add the garlic, sunflower seeds, and capers. Pulse a few times to finely chop. Then, to the food processor bowl, add the arugula, basil, lemon juice, miso, salt, and pepper. Pulse the mixture a few times until the greens are finely chopped. Then, with the lid on and the motor running on low, slowly drizzle in the olive oil through the feed tube until you have a smooth paste that’s evenly combined. Check the pesto for seasoning and adjust if necessary. Set aside.
Roast the vegetables. Combine the chopped eggplant, zucchini, bell pepper, red onion, and whole cherry tomatoes on the baking sheet. Drizzle the vegetables with the olive oil and season very generously with salt and pepper. Toss to thoroughly coat all of the vegetables in oil and seasoning. Spread the vegetables out into a single layer and roast in the oven until tender and slightly browned on the edges, about 30 minutes. Check on the vegetables at the halfway point and give them a stir with a spatula. Set aside to cool slightly.
Cook the orzo according to package directions and drain. Add the cooked orzo to a large serving bowl and immediately dress with the pesto. Once all of the pesto is coated, spread it out in the serving bowl. Top the dressed orzo with the roasted vegetables and chickpeas and give it another light toss.
Top the pesto orzo salad with some extra basil, arugula, and toasted sunflower seeds. Serve immediately.