Preheat the oven to 450°F.
On a rimmed baking sheet, spread the sweet potato, zucchini, onion, and chickpeas in a single layer, keeping each separate. Drizzle with 1 ½ to 2 tablespoons of olive oil, and season with salt to taste. Sprinkle the curry powder over the chickpeas. Toss each vegetable to coat leaving the chickpeas for last so the curry powder doesn’t transfer to the others. Roast for 20 minutes.
Meanwhile, in a small bowl, combine the tomato and kale. Drizzle with the remaining ½ to 1 tablespoon of olive oil, season with salt to taste, and toss to coat. Set aside.
In a medium heat-proof bowl, combine the couscous and boiling water. Cover and set aside.
After the vegetables have roasted for 20 minutes, toss them separately again, and add the tomato and kale mixture to the baking sheet. Bake for 10 minutes more. (Or leave the kale and tomatoes raw, if you prefer.) Once the vegetables are cooked to your liking, remove them from the oven let them cool slightly.
Fluff the couscous with a fork, and divide it among three bowls or lunch containers. Arrange the vegetables and chickpeas on top and drizzle with the dressing, or keep it separate until you’re ready to eat.
Store the cooked ingredients in airtight containers in the refrigerator for 3 to 4 days (tomatoes will go bad faster than the other vegetables).