Heat the olive oil in large saucepan over medium heat. Add the garlic, onions, cinnamon, cumin and turmeric. Saute until fragrant, 2 to 3 minutes. Add the turnips and saute for 5 minutes. Deglaze with the chicken stock. Add the chickpeas, apricots, figs, red pepper, squash and courgette. Stir and let simmer until tender, about 15 minutes. Discard the garlic and season with salt and pepper.
Put the couscous in a large bowl. Boil 2 1/2 cups water and pour over the couscous. Cover and let sit for 5 minutes. Fluff the couscous with a fork.
Add 1/2 cup couscous to a bowl and ladle on some stew. Garnish with some pistachios and coriander.