Steps
1. Preheat oven to 400°F (200°C).
2. Toss zucchini, bell peppers, red onion, and cherry tomatoes with olive oil, salt, and pepper.
3. Spread vegetables on a baking sheet and roast for 20 minutes, stirring halfway through.
4. While vegetables roast, bring water or vegetable broth to a boil.
5. Place couscous in a bowl, pour boiling liquid over it, cover, and let sit for 5 minutes.
6. Fluff couscous with a fork.
7. Add roasted vegetables, fresh parsley, lemon zest, and lemon juice to couscous and gently toss to combine.
8. Adjust seasoning with salt and pepper if needed.
9. Serve warm or at room temperature.