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Celeriac and Potato Soup with Mushroom, Walnut, and Celery Leaf Salad

Prep Time:30 minutes Cook Time: 45 minutes Servings: 4 minutes

This recipe was inspired by Deborah Madison's Vegetable Literacy, in which she details a recipe for a celeriac soup. I decided to put these beautiful, gnarly root veggies to use, taking quite a few liberties with the original recipe, adding a few potatoes for a more substantial soup.

Ingredients:
  • juice of 1 to 2 lemons
  • 2 celery roots
  • 4 to 5 medium carola or yukon gold potatoes (about 2 pounds), peeled
  • 2 medium shallots, finely diced
  • 2 celery stalks, chopped
  • 1/4 cup parsley, chopped
  • 1 garlic clove, minced
  • 1/2 cup dry white wine
  • sea salt
  • 6 cups homemade or store-bought vegetable or chicken stock (or water)
  • 1 tablespoon olive oil or other cooking oil
  • 1/2 teaspoon dijon mustard
  • 1 tablespoon red wine vinegar
  • 2 tablespoons walnut oil (see note below)
  • 3 to 4 pounds cremini mushrooms, thinly sliced
  • 1/3 cup walnuts, roughly chopped and lightly toasted
  • 1 tablespoon olive oil
  • 1/4 cup parsley, chopped
  • celery leaves from two bunches of celery (about 1 cup)
  • sea salt, black pepper
Directions:
  1. Squeeze the juice of 1 to 2 lemons into a large bowl of cold water and keep it close by as you work with the celery root. To clean the celeriac, trim the leaves and the stalks (set them aside for another use, if you wish). Peel the rough, gnarly skin by cutting a slice off the top and the bottom (the way you would peel a melon or pineapple). Then, carefully slide your knife down the sides, taking the peel off as you go. Cut the celery root into 1/2-inch cubes and immerse the slices into the lemon water as you work.
  2. Peel and dice the potatoes. Because the potatoes require slightly more time to cook than the celery root, be sure to cut the potatoes into roughly the same size or smaller. Chop the celery stalks into thin slices (and if they have leaves, trim and save the leaves for the salad below).
  3. Heat the oil in a soup pot over medium-high heat. Drain the celeriac (discard the lemon water) and then add the celery, celeriac, potatoes, shallots, and parsley to the soup pot. Cook, stirring from time to time, until the vegetables develop some color -- about 8 to 10 minutes. Add the garlic, wine, and 1 teaspoon sea salt, and cook for a few more minutes until the wine has reduced. Add 6 cups of stock (or water) and bring to a boil. Lower the heat and simmer, partially covered, for about 30 minutes or until the vegetables are tender. Take the soup off the heat and allow it to cool for a few minutes before transferring to a blender.
  4. Blend or pulse the soup very briefly until smooth but leave a good amount of texture. Potatoes also tend to get gummy if blended too long.
  5. Prepare the vinaigrette for the salad: In a small bowl, whisk together 1 tablespoon red wine vinegar, 1/2 teaspoon Dijon mustard, and 2 tablespoons walnut oil. Season with sea salt and black pepper.
  6. Trim celery leaves from two bunches of celery. Rinse and dry the leaves and then set them aside.
  7. Toast the walnuts lightly.
  8. Heat 1 tablespoon olive oil over medium-high heat in a large skillet. When the olive oil becomes fragrant, add the mushrooms and saute for a few minutes, stirring frequently, until they become brown and begin to release some water. Add 1/4 teaspoon sea salt and some freshly ground black pepper and cook for a few more minutes, stirring often, until the mushrooms are fully cooked through. Toss the mushrooms, walnuts, parsley, and celery leaves with the Dijon mustard vinaigrette.
  9. Serve the soup warm and top each bowl with two heaping tablespoons of the salad. Both the soup and salad will keep in the fridge overnight. The soup may be safely stored in the fridge for up to three days.
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