Floating on the surface of this pale, silky soup, which tastes of the essence of parsley, is a trompe l'oeil surprise: What looks like shaved truffles is actually thinly sliced chestnuts, adding a nutty sweetness.
Soup, without chestnuts, can be made 2 days ahead and chilled, uncovered, until cool, then covered. Reheat over low heat, thinning with water if necessary. Shave chestnuts over soup just before serving.
Recipe information
Total Time
1 1/4 hr
Yield
Makes 8 servings
Ingredients
Preparation
Make soup:
Step 1
Cook onion and garlic in butter in a large heavy pot over medium heat, stirring occasionally, until onion is softened and golden, 6 to 8 minutes. Add parsley root, thyme, bay leaf, white pepper, and 3/4 teaspoon salt and cook, stirring occasionally, until parsley root begins to soften, 8 to 10 minutes. Add water and broth and simmer, partially covered, until parsley root is very tender, 30 to 40 minutes.
Step 2
Discard thyme and bay leaf and stir in oil. Purée soup in batches in a blender until smooth (use caution when blending hot liquids), transferring to a bowl. If soup is too thick, thin to desired consistency with water. Season with salt, then return to cleaned pot to keep warm, covered, until ready to serve.
Step 3
Shave chestnuts with an adjustable-blade slicer or sharp vegetable peeler as thinly as possible over each serving.
