The sizzle of torn oyster mushrooms hitting a smoking-hot pan is the kind of kitchen sound that stops you mid-scroll — a sharp, crackling hiss that promises something deeply good is about to land on top of your dinner bowl.
This celeriac and pumpkin soup has become one of my most reliable weeknight meals through the colder months, and it’s not hard to see why. Celeriac is one of the most underrated and affordable root vegetables at the market — knobby, ugly, and absolutely delicious when roasted.
A whole squash stretches generously across four servings, and the total cost per bowl is remarkably low for something this satisfying. If you’re someone who likes to cook once and eat well for days, this is your recipe.
I often make a double batch on Sunday and portion it out for lunches through the week, sometimes alongside a bowl of creamy broccoli sweet potato soup for variety in the freezer rotation.
The real secret here is roasting the vegetables before they ever touch the pot. That blast of high heat caramelizes the edges, deepens the sweetness of the pumpkin, and brings out a nuttiness in the celeriac that you simply cannot achieve by simmering raw vegetables in broth.
The soup gets blended silky smooth, and then those crispy, umami-laden mushroom pieces go on top for a contrast of textures that keeps every spoonful interesting.
Why Roasting Celeriac and Pumpkin Before Blending Matters
I’ve made vegetable soups both ways — raw into the pot and roasted first — and the difference is night and day. When you toss diced celeriac and pumpkin with oil and slide them into a properly hot oven, the natural sugars in both vegetables begin to caramelize.
The pumpkin turns jammy and sweet at the edges while the celeriac develops a golden crust and a flavor that sits somewhere between celery root’s earthiness and the warmth of a roasted nut.
The key is making sure your oven is genuinely at 220C before the tray goes in. A lukewarm oven will steam the vegetables instead of roasting them, and you’ll miss out on that depth.
Spread them in a single layer with space between the pieces — crowding the tray traps moisture and you end up with soft, pale cubes rather than golden, flavor-packed ones. Give them a good 25 to 30 minutes, flipping once halfway through.
This is the same principle behind our roasted squash, sweet potato, and carrot soup — that roasted base gives the final bowl a richness that tastes like it took hours, when really the oven did most of the work.
How to Make Oyster Mushrooms Crispy Instead of Soggy
Most people have experienced the disappointment of mushrooms that release their liquid and just sort of sit there, pale and limp. The trick with oyster mushrooms is threefold: tear them by hand into strips rather than slicing (the ragged edges crisp better), make sure your pan is genuinely hot before they go in, and resist the urge to stir them constantly.
Let the strips sear undisturbed for a couple of minutes so the edges char and go crackly. Then give them a toss, hit them with a splash of soy sauce — it sizzles and reduces almost instantly, coating each piece in savory, salty depth — and finish with garlic and onion powder off the heat so the powders bloom without burning.
The result is chewy-crispy mushroom strips that taste almost like bacon in the way they hit that umami button. If you enjoy this kind of savory mushroom work, our savory creamy mushroom oatmeal uses a similar approach to big, meaty mushroom flavor.
What Does Celeriac Taste Like and How Do You Prepare It
Celeriac, also called celery root, tastes like a mellow, nutty version of celery with starchy undertones — think of it as a potato that actually has personality. When raw, it’s firm and slightly sharp.
Once roasted, it turns creamy and sweet with an earthy depth that pairs beautifully with squash and pumpkin.
Prepping it does require a sharp knife and a bit of patience. The skin is thick and knobby, so a standard vegetable peeler won’t cut it — literally.
I slice off the top and bottom to create flat surfaces, then use a sharp chef’s knife to shave away the peel in downward strokes, following the contour of the root. Don’t worry about getting every tiny crevice perfectly smooth; once it’s roasted and blended, nobody will notice.
Dice the peeled root into roughly 2cm cubes so they cook at the same rate as the pumpkin.
Can You Freeze Celeriac Soup? Storage and Meal Prep Tips
Absolutely, and this is one of the main reasons I keep coming back to this recipe. The soup base — without the mushroom topping — freezes beautifully for up to three months.
Let it cool completely, portion it into airtight containers, and leave a little space at the top for expansion. To reheat, warm it gently on the stove over medium-low heat, adding a splash of broth or water if it has thickened in the freezer.
The crispy mushrooms, on the other hand, don’t freeze or store well. They lose their texture and go rubbery.
Make those fresh each time — they only take about five minutes in a hot pan, and the effort-to-reward ratio is enormous. I usually whip up the mushrooms while the soup reheats.
The garnish of fresh herbs, a few toasted seeds, and a thread of good olive oil also make a real difference, so don’t skip those even on a busy Tuesday night.
If you’re building a rotation of freezer-friendly soups, this one works alongside recipes like our roasted tomato, fennel, and leek soup — different flavors, same reliable weeknight system.
Simple Swaps and Variations Worth Trying
No butternut squash on hand? Sweet potato works in its place and gives a similarly velvety result.
If celeriac is hard to find, parsnip is the closest substitute — it has that same sweet, earthy character that plays well against pumpkin. For the broth, a good-quality vegetable stock adds more flavor than water, but water works fine if you season generously with salt and let the roasted vegetables do the talking.
The plant-based cream at the end is entirely optional. I’ve made this soup both ways and it’s rich and smooth without it, thanks to the natural starchiness of the roasted vegetables.
If you want to use dairy cream instead, go for it — a small splash of single cream stirred in after blending adds a lovely roundness. The topping is where you can really play: toasted buckwheat groats give a nutty crunch, hemp seeds add protein, and a handful of crispy fried shallots takes the whole bowl somewhere even more indulgent.
This is the kind of recipe that rewards small, personal tweaks. Once you’ve made it once and know the base, you’ll find yourself adjusting it to whatever’s in the fridge — and that’s exactly how a good weeknight soup should work.
Creamy Roasted Celeriac and Pumpkin Soup with Crispy Mushrooms
Description
Ingredients
For the Soup
- 1 whole celeriac peeled and diced
- 1 whole butternut squash or pumpkin peeled and diced
- 1 medium onion chopped
- 3 cloves garlic minced
- 1 liter vegetable broth or water
- 2 tbsp cooking oil coconut, avocado, or ghee
- 0.25 cup plant-based cream optional
For the Mushroom Topping
- 250 g oyster mushrooms torn into strips
- 2 tsp soy sauce
- 0.5 tsp garlic powder
- 0.5 tsp onion powder
- to taste salt and white pepper
- 2 tbsp cooking oil
Garnish
- 1 handful wild garlic or chives thinly sliced
- 1 tbsp toasted buckwheat or seeds optional
- 1 drizzle extra virgin olive oil
Instructions
Preparation
- Preheat the oven to 220C.
- Toss the diced celeriac and pumpkin in oil, spread on a baking sheet, and roast until golden.
- In a large pot, saute the onion until caramelized, then add the garlic and cook until fragrant.
- Add the roasted vegetables to the pot, cover with broth or water, and simmer until tender.
- Puree the mixture using a blender until smooth, adding plant-based cream if desired for extra richness.
- Adjust consistency with more liquid if needed.
Topping and Assembly
- Heat oil in a pan over high heat and add the torn oyster mushrooms.
- Sear until charred and crispy at the edges.
- Season with salt and pepper, then splash in the soy sauce and toss.
- Sprinkle with garlic and onion powder, remove from heat, and toss once more.
- Serve the soup in bowls topped with the crispy mushrooms, fresh herbs, toasted seeds, and a drizzle of olive oil.
Notes
- Ensure the oven is hot enough to get a good char on the vegetables for depth of flavor.
- Watch the garlic powder closely when adding it to the mushrooms to prevent burning.
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