Celeriac Soup with Hazelnut Crumble

The first time I encountered celeriac, I almost dismissed it as the ugly duckling of the vegetable world. Knobby, brown, and unassuming, it sat in my kitchen for days before I finally worked up the courage to roast it. That afternoon, my entire apartment filled with this incredible warm aroma, somewhere between celery and earth, something I'd never experienced before.

Last February, when my sister came over complaining about the endless gray winter, I made this soup without telling her what was in it. She took one spoonful, eyes closed, and asked if I'd used some secret ingredient. Watching her reach for seconds while snow fell outside made me realize this humble root vegetable deserves way more attention than it gets.

Ingredients

• 1 large celeriac: Roasting first transforms its celery notes into something deeper and almost sweet
• 1 medium onion: Builds the aromatic foundation that makes everything taste like home
• 2 cloves garlic: Dont be shy with it, garlic loves celeriac's earthy personality
• 1 medium potato: The secret to that luxurious silky texture without being heavy
• 900 ml vegetable broth: Use one you actually like drinking, it becomes the soul of your soup
• 2 tbsp olive oil: One for roasting the celeriac, one for building your soup base
• 100 ml heavy cream or plant-based alternative: Optional but creates that restaurant-quality finish
• 1/2 tsp ground white pepper: White pepper keeps the soup pristine while adding gentle warmth
• Salt: Your seasoning best friend, taste as you go and trust your palate
• 70 g whole hazelnuts: Roughly chopped so you get satisfying crunch in every bite
• 1 tbsp unsalted butter or plant-based margarine: Coats the nuts with buttery richness
• 1/4 tsp sea salt: Finishing salt that makes each toasted nut pop
• 1 tbsp fresh parsley: A bright green confetti that makes everything look inviting

Instructions

Roast the celeriac to unlock its hidden sweetness:

Preheat your oven to 200°C, toss those cubed celeriac pieces with olive oil, salt, and pepper until they're glistening, then spread them on a baking tray and roast for 25 to 30 minutes, turning them halfway, until they're soft and taking on gorgeous golden edges.

Build your aromatic base while things roast:

Heat olive oil in your large pot over medium heat, sauté the onion for about 4 minutes until it goes from sharp to translucent and sweet, then add garlic and potato, giving them another 2 minutes to soften and become fragrant.

Bring everything together into a velvety soup:

Transfer those golden roasted celeriac pieces into your pot, pour in the vegetable broth, and bring it to a gentle bubble before lowering the heat to simmer for 15 to 20 minutes until all your vegetables are meltingly tender.

Create the magic hazelnut crumble:

Toast hazelnuts in a dry skillet over medium heat for 3 to 4 minutes, shaking the pan until they're fragrant and golden, then stir in butter and sea salt until each nut is beautifully coated, and remove from heat to cool slightly.

Transform into silky perfection:

Use your immersion blender right in the pot to purée everything until completely smooth, or work in batches with a countertop blender if you prefer, then stir in cream if you're using it and taste, adjusting salt and pepper until it sings.

Serve with generous handfuls of crumble:

Ladle that beautiful velvety soup into bowls and top with a generous scattering of hazelnut crumble and fresh parsley, letting everyone see those gorgeous golden flecks before they dive in.

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My neighbor knocked on my door the second time I made this, drawn by the aroma of roasting celeriac wafting through the building. We ended up sharing bowls right there in my tiny kitchen, both of us blowing on spoons and agreeing that this unassuming root vegetable had somehow become the most comforting thing we'd eaten all month.

Getting the Texture Right

Blend until the soup is completely smooth, with absolutely no bits remaining, because that silky consistency is what makes it feel luxurious and special. Take your time and keep blending until it reaches that gorgeous velvety stage.

Make It Your Way

Think of fresh thyme as an optional addition that brings an extra layer of aromatic warmth, or a squeeze of lemon juice right at the end to brighten everything beautifully. Both additions transform the soup slightly while keeping its soul intact.

Serving Suggestions

This soup becomes a complete meal with a slice of crusty bread for dunking, but it's also elegant enough to serve as a first course at dinner parties. A dry white wine like Pinot Gris alongside creates a perfect restaurant-worthy experience at home.

• Make the crumble right before serving so it stays perfectly crisp
• Try different nuts like pecans or walnuts for variation
• The soup actually tastes even better the next day

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There's something deeply satisfying about turning such an unassuming vegetable into something this elegant and comforting. Hope this finds its way into your regular rotation.

Recipe FAQs

→ Can I make this soup ahead of time?

Yes, the soup base can be prepared up to 2 days in advance and refrigerated. Reheat gently over medium-low heat, stirring occasionally. Prepare the hazelnut crumble fresh just before serving for optimal texture.

→ What can I substitute for hazelnuts?

Walnuts, pecans, or toasted pumpkin seeds work wonderfully as alternatives. Each brings slightly different flavor notes while maintaining the essential crunchy contrast to the smooth soup.

→ Is this soup freezer-friendly?

The soup base freezes beautifully for up to 3 months. Thaw overnight in the refrigerator, then reheat slowly. Add the cream after thawing if freezing, and always top with freshly made crumble.

→ How do I achieve the smoothest texture?

Roast the celeriac until completely tender before blending. Use a high-powered blender or immersion blender, puréeing for 2-3 minutes. For extra refinement, pass through a fine-mesh sieve.

→ Can I make this entirely dairy-free?

Absolutely. Simply use plant-based cream alternative and margarine or coconut oil for the crumble. The soup remains rich and satisfying without any dairy products.