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Celery Root–Parsnip Bistro Velouté with Crispy Mushrooms + Parsley–Caper Herb Oil

Celery Root–Parsnip Bistro Velouté with Crispy Mushrooms + Parsley–Caper Herb Oil

This is my February bistro hug: a silky celeriac velouté that tastes like a cozy sweater, but finishes like a bright day in California. I sweat the aromatics until they’re sweet, simmer celeriac and parsnip until tender, then blitz it smooth and wake it up with a punchy parsley–caper herb oil. Crispy mushrooms on top make it feel elegant without turning dinner into a project.

Marguerite Lavigne
Marguerite Lavigne
Prep: 20 minutes
Cook: 40 minutes
4
easy
soupdinnerlunch
celeriacbistro winterweeknight soupherb oil+1

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Ingredients

  • 900 g Celeriac (celery root), peeled and diced (about 1/2-inch)(About 1 large or 2 small bulbs)
  • 250 g Parsnips, peeled and diced(Optional but lovely for winter sweetness)
  • 1 Yellow onion, diced
  • 2 Shallots, thinly sliced(Because I’m me)
  • 3 Garlic cloves, smashed
  • 3 tbsp Unsalted butter(Bistro soul)
  • 6 tbsp Olive oil, divided(3 tbsp for soup + 3 tbsp for mushrooms (plus more if needed))
  • 1/2 cup Dry white wine (or dry vermouth)(Optional but very French and very helpful)
  • 5 cups Vegetable stock (or light chicken stock if you’re not vegetarian)(Add more to loosen texture as needed)
  • 1 Bay leaf
  • 6 sprigs Fresh thyme(Or 1/2 tsp dried thyme)
  • 2 tsp Kosher salt(Plus more to taste)
  • 1/2 tsp Black pepper(Plus more to taste)
  • 1/3 cup Crème fraîche(Or Greek yogurt; optional but makes it plush)
  • 1 tsp Lemon zest(From 1 lemon)
  • 1 tbsp Lemon juice(To taste)
  • 225 g Button or cremini mushrooms, torn or thick-sliced(Tearing gives craggy edges that crisp beautifully)
  • 1 1/2 tsp Sherry vinegar (or champagne vinegar)(For the mushrooms and/or to tweak the soup at the end)
  • 1 packed cup Flat-leaf parsley leaves(Tender stems are welcome too)
  • 1 tbsp Capers, drained(A salty little wink)
  • 1 tsp Dijon mustard(Helps the herb oil behave like a vinaigrette)
  • 1/2 cup Extra-virgin olive oil (for herb oil)(Use the green, grassy stuff)
  • 1 tbsp Warm water(Optional: to loosen herb oil if needed)

Instructions

  1. 1

    Sweat the aromatics: In a large pot over medium heat, melt 3 tbsp Unsalted butter with 2 tbsp olive oil. Add 1 Yellow onion, diced, 2 Shallots, thinly sliced, and 2 tsp Kosher salt. Cook 8–10 minutes until soft, glossy, and sweet—no browning, just tenderness. Stir in 3 Garlic cloves, smashed for 30 seconds.

    10 min

    Tip: Sweating is the whole point here: low drama, high flavor. If anything starts to color, lower the heat and add a splash of water.

  2. 2

    Simmer the soup: Add 900 g Celeriac (celery root), peeled and diced (about 1/2-inch) and 250 g Parsnips, peeled and diced, tossing to coat in the buttery aromatics. Pour in 1/2 cup Dry white wine (or dry vermouth) and let it reduce by about half. Add 5 cups Vegetable stock (or light chicken stock if you’re not vegetarian), 1 Bay leaf, and 6 sprigs Fresh thyme. Bring to a gentle simmer and cook until the celeriac is completely tender, 18–25 minutes.

    25 min

    Tip: Celeriac should crush easily with a spoon. If it fights you, simmer longer—silkiness comes from tenderness.

  3. 3

    Make the parsley–caper herb oil (my bright finish): In a blender, combine 1 packed cup Flat-leaf parsley leaves, 1 tbsp Capers, drained, 1 tsp Dijon mustard, 1 tsp Lemon zest, 1/2 cup Extra-virgin olive oil (for herb oil), and a pinch of salt. Blend until vivid green and smooth. Add 1 tbsp Warm water if you want it more drizzle-friendly. Taste: it should be punchy and a little briny.

    5 min

    Tip: This is halfway between herb oil and vinaigrette—exactly the point. It should cut the soup like sunlight through winter fog.

  4. 4

    Crisp the mushrooms: Heat 3 tbsp olive oil in a skillet over medium-high. Add 225 g Button or cremini mushrooms, torn or thick-sliced in a single layer and don’t touch for 2–3 minutes. Season with salt and pepper, then continue cooking, stirring occasionally, until deeply browned and crisp at the edges, 6–8 minutes total. Finish with 1 1/2 tsp Sherry vinegar (or champagne vinegar).

    10 min

    Tip: Crowding steams mushrooms. If your pan is small, do two batches—future you will thank you.

  5. 5

    Blend and finish the velouté: Fish out 1 Bay leaf and 6 sprigs Fresh thyme. Blend the soup until completely smooth (immersion blender or countertop blender). Stir in 1/3 cup Crème fraîche (if using), then adjust with 2 tsp Kosher salt, 1/2 tsp Black pepper, and 1 tbsp Lemon juice. If it’s thicker than you like, add a splash of stock or water until it pours like velvet.

    7 min

    Tip: If using a countertop blender, vent the lid and cover with a towel—hot soup loves drama.

  6. 6

    Serve: Ladle hot soup into bowls. Spoon 225 g Button or cremini mushrooms, torn or thick-sliced on top and finish with generous ribbons of parsley–caper herb oil. Black pepper over everything.

    2 min

    Tip: I like serving this with a hunk of toasted sourdough rubbed with garlic—bistro law.

Chef's Notes

This soup came from a rainy-market February when my celeriac guy (yes, I have a celeriac guy) handed me a knobbly monster and said, “She’s ugly but she’s sweet.” That’s basically my entire culinary philosophy. If you want it vegan, skip the butter and crème fraîche—use olive oil and a spoonful of cashew cream or just go fully dairy-free and lean into the herb oil finish. Pairing: a chillable red like Mondeuse or a mineral white like Muscadet—nothing oaky, please, we’re trying to flirt with the parsley.

Frequently Asked Questions

How long does Celery Root–Parsnip Bistro Velouté with Crispy Mushrooms + Parsley–Caper Herb Oil take to make?

Celery Root–Parsnip Bistro Velouté with Crispy Mushrooms + Parsley–Caper Herb Oil takes about 1 hour total. That includes 20 minutes of prep and 40 minutes of cooking.

How many servings does this recipe make?

This recipe makes 4 servings.

What skill level is needed for Celery Root–Parsnip Bistro Velouté with Crispy Mushrooms + Parsley–Caper Herb Oil?

This recipe is rated easy — it's beginner-friendly and straightforward.

What ingredients do I need for Celery Root–Parsnip Bistro Velouté with Crispy Mushrooms + Parsley–Caper Herb Oil?

The main ingredients are: Celeriac (celery root), peeled and diced (about 1/2-inch), Parsnips, peeled and diced, Yellow onion, diced, Shallots, thinly sliced, Garlic cloves, smashed, Unsalted butter, Olive oil, divided, Dry white wine (or dry vermouth), Vegetable stock (or light chicken stock if you’re not vegetarian), Bay leaf, Fresh thyme, Kosher salt, Black pepper, Crème fraîche, Lemon zest, Lemon juice, Button or cremini mushrooms, torn or thick-sliced, Sherry vinegar (or champagne vinegar), Flat-leaf parsley leaves, Capers, drained, Dijon mustard, Extra-virgin olive oil (for herb oil), Warm water.

What type of meal is Celery Root–Parsnip Bistro Velouté with Crispy Mushrooms + Parsley–Caper Herb Oil?

Celery Root–Parsnip Bistro Velouté with Crispy Mushrooms + Parsley–Caper Herb Oil is categorized as: soup, dinner, lunch.