Heat the oil in a large pot. Add the onion, leeks, and garlic and cook over moderate heat, stirring occasionally, until tender, about 5 minutes. Stir int he barlet. Add teh vegetable broth, water, thyme, and bay leave and bring to a boil. Add the celery root and parsnips and season with salt and pepper. Simmer over moderately low heat until the barley and root vegetables are tender, about 40 minutes.
Stir in the spinach and nutmeg and simmer for 5 minutes. Season again and serve in deep bowls.
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