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Heat 2 tbsp of the oil in a pan over a medium heat and cook the onion for 8-10 mins until softened. Add the garlic and spices, and cook for 2 mins more until fragrant. Tip in the rice and 450ml boiling water from the kettle along with the lemon zest and ½ tsp salt. Cover, reduce the heat to medium-low and cook for 20 mins, or until all the water has been absorbed and the rice is cooked through. This process can also be done in the oven: cook everything in a flameproof casserole and transfer to the oven once the rice and water has been added, covering and cooking for 20-25 mins at 190C/170C fan/gas 5.
Heat the rest of the oil in a second pan over a medium-high heat and fry the courgette slices for 4 mins until slightly coloured and the edges are just softened. Stir in the chickpeas and cook for 2 mins more until warmed through. Season well.
When the rice is cooked through, add half the lemon juice and fluff up the rice with a fork. Add the chilli flakes, if using, and chopped dill to the courgette and chickpea mixture. Season well. Stir in the remaining lemon juice and a drizzle of oil. Serve the rice with the courgettes.