Place the water in a large sauce pan fitted with a steamer basket over high heat. Put the cubed squash in the steamer basket. Steam until tender (20 - 30 minutes).
Let the squash cool and then add it to the remaining steaming water in the bottom of the sauce pan. Using a stick blender or a blender puree the squash and water until smooth.
Place the pan over low heat and add the salt, pepper, thyme leaves and ground nutmeg.
Reheat the soup gently. Stir in the remaining water to the desired consistency. It may take as much as 1 1/2 to 2 cups.
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