POTATO, PARSNIP, AND CELERY ROOT SOUP

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Potato, Parsnip, and Celery Root Soup image

Categories     Potato     Low Sodium     Celery     Parsnip     Spring     Kosher     Simmer     Boil

Yield Makes about 8 cups

Number Of Ingredients 16

1 tablespoon unsalted butter
1 tablespoon extra-virgin olive oil
2 large leeks, white and light green parts only, sliced
Kosher salt
2 large Yukon gold or other waxy potatoes (about 1 pound), peeled and diced
2 medium parsnips (about 8 ounces), peeled and diced
1 medium celery root (about 10 ounces), peeled and diced
2 large cloves garlic, chopped
1 teaspoon ground mustard
4 large sprigs thyme
1 bay leaf
1/4 cup dry white wine or dry vermouth
4 cups homemade vegetable broth (or low-sodium store-bought broth)
1 cup water
1/4 cup heavy cream (optional)
1 tablespoon freshly squeezed lemon juice, more as needed

Steps:

  • In a soup pot or large Dutch oven, heat the butter and oil over medium-low heat. Add the leeks and 1/2 teaspoon salt and cook, stirring occasionally, until soft and translucent, 6 to 8 minutes. Add the potatoes, parsnips, celery root, and garlic, cover the pot, and stir occasionally until the veggies are heated through and softening a bit on the edges, about 10 minutes. Add the mustard, thyme, and bay leaf and continue to cook for 2 more minutes, or until aromatic. Add the wine and cook until the liquid has completely evaporated, about 1 minute.
  • Add the broth and water, cover the pot partially, and increase the heat to medium-high. Bring just to a boil, then lower the heat to maintain a gentle simmer. Continue to cook, partially covered, until the vegetables are completely soft and have started to break down a bit, 45 minutes to 1 hour.
  • To finish the soup, remove and discard the thyme stems and bay leaf and, working in batches, carefully puree the soup in a blender (or use an immersion blender). If you prefer a thinner soup, add a little more water to adjust the thickness.
  • Stir in the cream and the lemon juice and taste. Adjust with more lemon juice or salt as needed and reheat as necessary.
  • tip
  • This soup is wonderful garnished with fresh croutons sautéed in butter and some chopped chives.

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