Food & Wine’s Kay Chun sneaks a small piece of Parmesan cheese into this lovely soup, giving it a flavor boost. To make it extra special, she serves the silky bisque topped with a nutty, crunchy and vibrant walnut-and-parsley gremolata.
Slideshow:More Celery Root Recipes
1 tablespoon unsalted butter
1 large leek, white and light green parts only, thinly sliced
5 garlic cloves, crushed
2 1/2 pounds celery root, peeled and cut into 1-inch dice (8 cups)
One 2-inch chunk of Parmigiano-Reggiano cheese (1 ounce), plus 1/4 cup freshly grated cheese
2 cups chicken stock or low-sodium broth
1/2 cup walnuts
1/4 cup extra-virgin olive oil
1/2 cup coarsely chopped parsley
1/2 cup heavy cream
How to Make It
In a large saucepan, melt the butter. Add the leek and garlic and cook over moderate heat, stirring occasionally, until softened, 5 minutes. Add the celery root, Parmesan chunk, stock and 5 cups of water and bring to a simmer. Cover and cook over moderately low heat, stirring occasionally, until the celery root is tender, 40 minutes.
Meanwhile, preheat the oven to 375°. Spread the walnuts in a pie plate and toast for 5 to 7 minutes, until golden. Let cool, then finely chop and transfer to a bowl. Add the oil, parsley and grated cheese and mix well.
In a blender, puree the soup in 2 batches until very smooth. Pour into a clean saucepan and stir in the heavy cream; season with salt and pepper and reheat if necessary. Serve topped with the walnut gremolata.
The soup can be refrigerated for 2 days.
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