Saut� the onions in a pot over medium-high heat until they become translucent.
Add the cubed squash and stock to the onions.
Bring the mixture to a boil and turn the heat down to a simmer.
Continue simmering until the squash is soft. Test the squash with a fork.
Puree small batches of the mixture with a blender until it is smooth. Place back into the pot when all of the mixture is pureed.
Add the nutmeg, salt, and pepper to desired taste. Serve immediately.
