Prepare the Couscous: In a medium pot, bring the vegetable broth or water to a boil. Remove from heat, stir in the couscous, cover, and let sit for 5 minutes. Fluff with a fork and drizzle with olive oil. Season with salt and pepper.
Grill the Vegetables: Preheat a grill or grill pan to medium-high heat. Toss the sliced zucchini, bell pepper, eggplant, and red onion with olive oil, salt, and pepper. Grill the vegetables for 3-5 minutes per side, until they’re tender and have visible grill marks.
Assemble the Bowl: Divide the couscous between bowls and top with the grilled vegetables. Add a generous scoop of hummus to each bowl and scatter the olives over the top.
Garnish and Serve: Garnish the bowls with chopped fresh herbs and a drizzle of olive oil. Serve immediately.