Blend the chopped lime leaves with the rest of the curry paste ingredients in a food processor.
Heat the oil in a large saucepan, add the curry paste and cook on a medium heat for 2-3 mins. Pour in the coconut milk and bring to a simmer. Add the chicken, lime zest and juice, then season and cover. Gently simmer for 30 mins until the chicken is tender.
Remove the lid and cook for a further 10 mins. Add the green beans, mangoes and whole lime leaves and cook for 5 mins. Add the coriander leaves just before serving with hot jasmine rice.