Place the couscous in a large bowl. Place the chicken stock, garlic, olive oil, salt and spices in a large measuring jug and whisk until combined. Pour the stock over the couscous and stir to combine. Scatter the raisins over the couscous. Place a tea towel over the bowl and leave the couscous to cook for 10 minutes or according to the instructions on the package. Meanwhile, prepare the vegetables.
Fluff the couscous with a fork. Stir in the vegetables and lemon zest. Place all of the ingredients for the dressing in a jar with a lid and shake to combine. Pour the dressing over the couscous and toss well. Season with pepper and divide the salad between serving plates.