Heat an indoor grill or outdoor barbecue to medium. Brush the vegetables with oil, and grill for 2-3 minutes per side. Do not overcook the zucchini; remove it from the grill while it's still semi-firm. When cool enough to handle, dice the vegetables into ¼-inch pieces. You should have about 2 cups of zucchini and 1 cup of peppers.
Combine the oil, lemon juice, garlic, and herbs. Pour over the quinoa and toss to coat. Stir in the grilled vegetables. Add salt and pepper, to taste. At this point, the quinoa mixture can be covered and refrigerated until ready to serve.
To serve, toss the quinoa mixture (chilled or room temperature) with the arugula. Spread about ⅓ cup of hummus on one side of each plate or bowl and serve the salad on the other side of the plate/bowl with some covering a bit of the hummus. Sprinkle with dukkah, and drizzle with olive oil and lemon juice, if desired.
Notes
*Dukkah is a blend of herbs, nuts, and spices. If you don't have dukkah, you can use chopped pistachios or toasted almonds.