Put the coconut milk, chicken stock, lemon grass and curry paste in a flameproof casserole dish with a lid, and bring to the boil, stirring with a wooden spoon until the paste dissolves.
Add the rice and green beans and simmer gently for 5 minutes.
Lay the salmon fillets on top of the rice. Season then cover and cook for a further 5-8 minutes until the rice is tender but not completely dry, and the fish is just cooked through.
Garnish with the coriander leaves and serve with lime wedges to squeeze over.