Creamed celery root soup--for the snobbish taste

Ingredients

• 1 pound celery root,
• 2 large potatoes,
• 1 medium onion,
• 4 cups vegetable stock,
• 2-3 cups of water,
• 1 tablespoon butter,
• 3 tablespoons oil,
• 1/4 cup sour cream,
• 1/2 teaspoon ground nutmeg,
• 2 tablespoons of any hard blue cheese,
• salt and pepper.