Prepare the korma paste: If making homemade korma curry paste, follow the recipe instructions here. If using a shop-bought version, proceed with the steps below.
Cook the chicken: Cut the chicken thighs into bite-size pieces. Heat the oil in a large frying pan and fry the chicken with 1 tablespoon of korma paste and a little salt until lightly browned. Remove from the pan and set aside.
Cook the aromatics: Using the same pan, add a splash of oil and fry the onion until soft. Add the crushed garlic and chopped green chilli and cook for 30 seconds.
Toast the spices: Stir in the remaining korma paste with a small splash of oil and fry gently for about 30 seconds until fragrant. Take care not to burn the spices.
Make the mango sauce: Remove the mango flesh and blend it with the coconut milk until smooth.
Simmer the curry: Return the chicken to the pan and pour in the mango-coconut mixture along with the chicken stock. Bring to a gentle boil, then cover and simmer for 20 minutes until the chicken is tender.
Reduce the sauce: Remove the lid and cook for a further 10–15 minutes until the sauce thickens. If it becomes too thick, add a splash of water to loosen it.
Finish the curry: Taste and season with salt if needed. Add a squeeze of lime juice and stir. Garnish with coriander leaves and serve with basmati rice, naan bread and lime wedges.