Heat the coconut oil in a large pan over a medium heat and add the curry paste. Cook gently for 2-3 minutes or until fragrant. Add the onion and a pinch of salt, then cook for 10 minutes until translucent. Add the coriander stalks, ginger, garlic and ½ the chilli, then cook for 2 minutes. Tip in the butternut squash, stock and a little more seasoning, and simmer for 30 minutes until the squash is very tender. Add the lime juice, then use a hand blender to whizz until completely smooth. Divide between bowls, then top with the coriander leaves and remaining chopped chilli.