While stock is heating, chop all vegetables into small pieces (approximately 1/2 inch cubes).
In a saute pan, over med-high heat, melt half of the butter. Sauté vegetables with ginger and nutmeg for approximately 15 minutes, or until vegetables are browned. Add remaining butter as needed.
Add sautéed vegetables to stock, reduce heat, cover with a lid, and simmer for 30 minutes.
Let cool to room temperature and then puree in a blender. Soup should be thick and smooth. If you like your soup chunky, skip this step.