How to Make It
Light a charcoal grill or preheat the broiler. Brush the zucchini, squash, bell peppers, onions and eggplant with 1/2 cup of the olive oil and season with salt and pepper. Grill the vegetables in batches, turning occasionally, until tender and browned, about 12 minutes for the zucchini, squash and peppers and 20 minutes for the eggplant and onions. Transfer the vegetables to a platter as they are cooked and let cool.
In a small skillet, toast the pine nuts until lightly browned, about 1 minute. In a food processor or blender, combine the basil with the garlic, lemon juice, water and pine nuts and pulse until finely chopped. With the machine on, slowly add the remaining 1/2 cup of olive oil and process until smooth. Add the Parmesan and pulse to blend. Season with salt and pepper. Drizzle the pesto dressing over the grilled vegetables and serve.