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Soup: Heat butter and oil over medium heat in a dutch oven or large heavy bottomed pot.
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Add onion and saute until translucent, 4-5 minutes.
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Add garlic and saute 2 minutes.
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Add celery and celery root and cook another 2-3 minutes.
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Add 4 cups chicken stock, stir well to combine.
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Season well with salt and white pepper.
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Bring to a boil and reduce to a simmer. Cover and cook until celery root is softened, about 30 minutes.
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Puree until smooth with an immersion blender or in a blender. Add additional stock if needed to thin.
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Stir in cream and heat until warmed through.
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Herbed Olive Oil: Finely mince herbs in a food processor or mini prep.
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Add olive oil, salt and pepper and blend well.
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To serve: Drizzle soup with herbed oil.
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Extra herbed oil can be stored in the refrigerator for another use.