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Heat oven to 220C/200C fan/gas 7. Place the potatoes, fennel, carrot, pepper and onion in a roasting tin with 3 tbsp oil, the cumin, fennel and coriander seeds, and salt and pepper. Use your hands to coat everything, then roast for 30 mins, stirring once, until tinged and the potatoes are cooked through.
Meanwhile, heat a large pan over a medium heat and add the remaining 1 tbsp oil. Fry the garlic until fragrant, then add the tomatoes, chickpeas, wine, orange zest and juice, cinnamon stick and prunes. Bring to the boil and simmer while the vegetables roast. Add roasted vegetables to the tin and stir. Return to a simmer and cook for 15-20 mins. Serve over warm couscous scattered with toasted flaked almonds, if using.