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Heat the oil in a large flameproof casserole dish over a medium-high heat. Add the onion and a pinch of salt and fry for 5-6 mins. Add the chicken and fry for 7-8 mins more. Stir in the jerk seasoning, chilli, if using, and garlic, and cook for 1 min.
Stir in the rice, beans and lime zest and juice. Cook until heated through. Scatter over the spring onions, coriander and serve with the extra lime wedges.