Add all the ingredients (squash, onions with coconut milk, broth, ginger, maple syrup, lime juice) into a blender and blend until smooth and creamy. Season with salt. Return soup to the pot and thin, if necessary, with additional stock until desired consistency is reached.
If you’re working with an immersion blender, add all the ingredients to the pot, bring the mixture to a simmer and cook, stirring occasionally, for 15 minutes so the flavors have a chance to meld. Carefully use your immersion blender to blend the soup completely.