Preheat the oven to 425 degrees F. Line a sheet pan with parchment paper.
In a large bowl, whisk the cumin, smoked paprika, salt, black pepper, garlic, honey, harissa paste and olive oil.
Stir the carrots and chickpeas into the honey-harissa marinade, so they are fully coated in the mixture.
Transfer the carrots and chickpeas to the prepared sheet pan, spreading them in a single layer.
Roast the carrots and chickpeas for 15 minutes. Add the halloumi to the pan, tossing it with the carrots and chickpeas, arranging everything in a single layer. Continue roasting for 10-15 minutes until the halloumi is lightly golden, the carrots are tender and the chickpeas are crispy.
For the couscous, combine the couscous grains, boiling water and lemon juice in a large bowl. Cover and let sit for 5 minutes. Use a fork to comb through the couscous, breaking up any clumps. Stir in the lemon zest, scallions and parsley.
Serve the carrots, chickpeas and halloumi with the couscous garnishing with more chopped parsley.