Heat a large saucepan over a medium heat and add the oil. When hot, add the onion and garlic and cook, stirring occasionally for 5-6 minutes until soft.
Bash the fat ends of the lemongrass stalks a couple of times with a heavy spoon to help release the flavour.
Add to the saucepan along with the turmeric, chilli and ginger and cook for 30 seconds, stirring continuously, then pour over the coconut cream, lime juice, fish sauce and sugar and mix well. Bring to the boil, cover, reduce the heat to low and simmer gently for 10 minutes, stirring occasionally.
Add the salmon pieces, then cook uncovered for another 8-10 minutes or until the fish is tender and the sauce is lovely and thick.
While the salmon is cooking, prepare the quinoa as per the packet instructions. Once the quinoa is drained add to a dish with the juice of 1 lemon to make it extra lemony add the zest too. and steam the green beans.
Once the salmon has poached, add in the coriander, gently mix together and serve immediately with quinoa and greens of your choice.