Bring the coconut milk to a boil, add salt. Check the curry here before you do so because the paste/sauce you added will have sauce too. And I am assuming you have boiled your noodles with salt anyways. Because, in my opinion, is one of the most important steps in making noodles. Boil them in salted water, really salted water actually. Water that tastes like the sea and see your noodles really shining in the final dish.