Pick the coriander leaves from stalk, and then finely chop stalk. Using the flattened blade of your knife, crush the lemongrass. Slice spring onions finely at an angle.
Heat the oil & soy sauce over medium heat in a heavy pot, add the sliced onions, coriander stalk & cut chilli – stirring well till onion takes on a golden color. Add in the garlic & shrimp paste – stirring well till aroma rises.
Next, add in the turmeric, lemongrass and spices – let simmer for an additional minute. Finally add in the coconut milk and bring to boil. Once curry starts boiling – reduce heat to simmer, and add in the fish. Cover and let simmer for an additional 5 minutes.
Serve curry over jasmine rice and garnish with saved coriander leaves. A dash of lemon / soy sauce & ground black pepper works great if more seasoning required.