Celeriac Soup with Hazelnut Crumble

The first time I encountered celeriac, I was standing in a tiny Parisian kitchen watching my neighbor Madame Lafleur wrestle with what looked like an ugly, dirt-covered rock. She laughed at my skepticism, then proceeded to turn this humble root into something so elegant and comforting that I completely forgot its gnarly appearance. Now, every autumn when the weather turns crisp, I find myself craving that same earthy, velvety warmth.

Last November, during a particularly rainy dinner party, I served this soup while my friends sat around my tiny table, candles flickering against the gray window light. Everyone went quiet after the first spoonful, which I've learned is the highest compliment a soup can receive. The hazelnut crumble became such a hit that my friend Sarah still texts me whenever she makes it, usually with some variation of I may have eaten the entire batch standing at the counter.

Ingredients

• 1 large celeriac: Roasting first transforms its sharp celery notes into something mellow and slightly sweet, almost like a parsnip met a potato and fell in love
• 1 medium potato: Just enough to add body without masking the celeriacs distinctive personality
• 1 medium onion and 2 cloves garlic: The aromatic foundation that makes your whole kitchen smell like a cozy French bistro
• 900 ml vegetable broth: Use a good quality one you would happily drink on its own
• 100 ml heavy cream or plant-based alternative: Completely optional but adds that silkiness that makes people ask what your secret is
• 70 g hazelnuts: Toasted with butter and salt until they become little savory crumbles that elevate everything
• 1/2 tsp ground white pepper and salt: White pepper keeps the soup pristine while adding gentle warmth

Instructions

Roast the celeriac until golden:

Toss those peeled cubes with olive oil, salt, and pepper, then spread them on a baking tray and let them roast at 200°C for about 25 minutes, turning once halfway through, until theyre soft and caramelized at the edges

Build your soup base:

While the celeriac roasts, heat olive oil in your pot and sauté the onion for 4 minutes until translucent, then add garlic and potato for another 2 minutes until fragrant

Simmer everything together:

Add those beautiful roasted celeriac pieces to the pot along with vegetable broth, bring to a gentle bubble, then simmer for 15 to 20 minutes until all vegetables are completely tender

Make the magic crumble:

In a dry skillet, toast the hazelnuts over medium heat for 3 to 4 minutes until fragrant, then stir in butter and sea salt until the nuts are golden and glossy

Purée until silky:

Blend with an immersion blender until completely smooth, stir in cream if using, then taste and adjust your seasonings

Serve with generous topping:

Ladle into warm bowls and shower each portion with that buttery hazelnut crumble and some fresh parsley if you have it

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My grandmother would have called this peasant food, meant for cold mornings and empty pantries, but I think theres something profound about taking the most humble ingredients and treating them with such care. Thats the kind of cooking that really feeds people.

Making It Your Own

Sometimes I add a sprig of fresh thyme during simmering, which leans the flavor slightly more herbaceous and bright. A squeeze of lemon juice just before serving can also be brilliant, especially if your celeriac is particularly earthy that day.

Perfect Pairings

A dry white wine like Pinot Gris cuts through the richness beautifully. For something more substantial, I love serving this alongside a simple green salad dressed with a sharp vinaigrette, or maybe some crusty bread for dunking.

Make-Ahead Wisdom

This soup actually improves after a day in the refrigerator, as the flavors have time to really marry and deepen. Store the crumble separately and add it just before serving.

• The soup keeps beautifully for up to 4 days
• Reheat gently over low heat to prevent separating
• Never blend hot soup in a regular blender without venting, unless you want an explosive kitchen disaster

Save

Save

There is something deeply satisfying about turning such an ungainly root vegetable into something so elegant and comforting. Maybe that is the best kind of magic.

Recipe FAQs

→ What does celeriac taste like?

Celeriac has a subtle, earthy flavor combining mild celery sweetness with nutty undertones. When roasted, these flavors concentrate and mellow into a creamy, savory profile that pairs beautifully with the hazelnut topping.

→ Can I make this soup ahead?

Absolutely. The soup base keeps beautifully in the refrigerator for 3-4 days or freezes for up to 3 months. Store the hazelnut crumble separately in an airtight container and add fresh when serving to maintain that perfect crunch.

→ Is this soup suitable for special diets?

Yes! Simply swap heavy cream for coconut milk or cashew cream, and use plant-based margarine instead of butter. The result remains velvety and satisfying while being completely vegan and gluten-free.

→ Why roast the celeriac first?

Roasting caramelizes the natural sugars in celeriac, deepening the flavor profile far beyond boiling alone. The golden-brown edges add subtle sweetness and richness that creates restaurant-quality depth in every spoonful.

→ What can I serve alongside?

Crusty artisan bread, warm focaccia, or simple crackers make excellent accompaniments. A crisp white wine like Pinot Gris or Sauvignon Blanc cuts through the creaminess beautifully, while a light arugula salad adds fresh contrast.

→ Can I substitute the hazelnuts?

Walnuts, pecans, or even pumpkin seeds work wonderfully as alternatives. Each brings slightly different nutty notes while maintaining that essential crispy texture that makes this dish special.