You can buy pomegranate molasses in large supermarkets, delis or Middle Eastern shops – or make your own by simmering pomegranate juice until thick and sticky.
Heat the oil in a casserole over a medium heat. Season the chicken with salt, pepper and paprika, then brown in the hot oil for 7–8 minutes. Remove the pieces to a plate and set aside.
In the same pan, add another splash of oil with the onions. Stir well, being sure to catch the sticky bits at the bottom of the pan. Cook slowly for 15 minutes, till onions are soft, adding the garlic, chilli and the coriander for the last 5 minutes. Stir in the passata, molasses and pomegranate juice, season well, then bring to the boil.
Return the chicken with any juices to the pan, cover and lower heat. Simmer for 30 minutes, until the chicken is cooked and the sauce has thickened, checking often that it’s not sticking. Toss the rice with the extra coriander, then place the chicken on top and scatter with pomegranate seeds.