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Roasted Celeriac is an amazing low carb alternative to delicious potatoes parmentier or roast potatoes. Perfect for a midweek dinner or the holiday table. Garlicky and deeply herbal. Why not serve it this Thanksgiving?roasted celeriac with herbs and garlic in a green and white vintage plate

Parmentier – pär’-män-tyā. Meaning “with, or made of, potatoes” in French.

In the UK, if someone mentions parmentier potatoes, one automatically thinks of the beloved upmarket food store, Marks and Spencer. They have that heavenly side dish locked down. It’s sooooo delicious. I’ve only ever had it a few times, but it’s memorable stuff. Tiny cubes of potato roasted with chopped rosemary and garlic. Buttery, salty, yum.

vertical image of celeriac parmentier in white and green dish on pale backgroundRecently I had a brainwave. Why not ‘parmentier’ celeriac? Celeriac gets little to no love, despite being a fairly credible low-carb substitute for potatoes. It also cooks way quicker. Which is a huge bonus for a midweek recipe. So, despite knowing that parmentier is shorthand for potatoey things, I thought I would cheekily claim a bit of that parmentier action for this recipe. See what you think. And, if you feel weird saying parmentier celeriac, just call it roasted celeriac.

peeling a celeriacBut first, let’s talk about celeriac.

Has there ever been a less unprepossessing looking vegetable? Its lumpy, ridged texture does not exactly invite you to pick it up. For those unfamiliar with it, in celeriac’s freshly dug-up state it bears more than a passing resemblance to one of the most feared of the Dr Who creatures – the Ood. Luckily, what you get at the supermarket is less likely to cause nightmares. Its tentacle-like pale roots, matted and covered in soil, are usually given a sanitising trim and wash. But, unless you have tasted it, or someone like me insists you buy it, you wouldn’t reach for it without considerable pause.

What is it exactly? Well, it is a type of celery grown just for its root. The leaves are way too strong for common use, but the hefty, fearsome-looking bulb is quite a splendid vegetable in both its raw (think celeriac remoulade) and cooked state. In fact, when cooked in a gratin, with cream and some potato, it tastes very much of summer truffles. Which is obviously a selling point. I have a wonderfully simple, and really good, Chestnut and Celeriac Soup that highlights this taste note. Without cream or potatoes, I should add. The truffle toast I recommend may help with that. 🙂

Other than truffles, what does celeriac taste like? It has a fresh, clean, soft celery flavour. Celery itself can be too strong tasting for some, but in celeriac form the flavour is much milder. More buttery and nutty, too.  I like the fact that it lacks the sweetness of carrots and parsnips – although when roasted the little natural sugars it has comes through. It is a much under-rated and under-used vegetable. I hope this recipe shows you just how delicious it can be. And it is very simple to make, too.

Nutritionally, it is an interesting vegetable. Although I am all about colour in my recipes, the paleness here is not visual shorthand for zero nutrients. We aren’t talking kale-level nutrients, but celeriac is a decent source of filling fiber, vitamins B6 and C, potassium, magnesium, manganese and phosphorus. It is also very low in both carbohydrates and calories. Which, to me at least, makes its addition to a calorific holiday meal a no-brainer.

close up of roasted celeriac on green and white vintage platter with spoonHow to choose and prep celeriac

A bit of kitchen wisdom to make the most of your “Ood”.

1. When buying, look for a solid firm ball; heavy for its size. It may or may not have the roots still attached. You don’t want any soft bits.

2. In common with other root vegetables, celeriac keeps well in a cool (or cold) room. I store mine in a net bag in the garage. You may also refrigerate it. If it comes wrapped in plastic, remove the plastic, pat it dry of any moisture and wrap loosely in a paper towel or cloth. Moisture is the enemy of root vegetables! Only rinse the celeriac before you are getting ready to peel it.

3. To trim the celeriac, begin by using a heavy, rigid knife to slice off the top and bottom. Most of any dirt will be in the roots, so make sure to clear them away if present. Now sit the celeriac on either end and slide the knife down the sides to gradually remove the skin. Most Y-peelers aren’t up to the job of peeling celeriac. Using a knife actually takes less time. But it must be a heavy, sturdy knife unless you are exceedingly cautious.

4. If you aren’t using your peeled and cut celeriac right away, cover it in water with a squeeze of lemon added. This will keep it from browning (oxidising). You may need to place a plate on top to keep them under the acidulated water. I would do this only only the day of cooking or grating it.

Using your celeriac

As for eating it, as I wrote above, you can have celeriac raw or cooked.

The first time I knowingly ate celeriac was in France as celeriac remoulade. Purchased from a gas station after a late flight, I think. To this day it is Andrew’s favourite salad. We all love it. It’s really the only raw salad that I crave in winter. This dish looks like a drift of snow: it’s just the white gratings of celeriac, crème fraîche, best mayo and a little Dijon and lemon. Very pale and glistening.

In cooked recipes it can be used on its own or with other vegetables. I would steer clear of using celeriac with strong-tasting vegetables, like parsnips. It’s lovely as a mash, or as half mashed potato and half mashed celeriac. This is a really gorgeous mix to top a fish pie or shepherdess pie.

Other Celeriac recipes on Food To Glow

Velvety Celeriac and Chestnut Soup – this would be a fabulous winter dinner party starter served with the recommended horseradish and truffle toasts

Celeriac and Carrot Rösti Cake with Remoulade Sauce – this is so good, my friends. And really impressive as a centrepiece type of dish.

Celeriac Rösti Waffles with Creamy Crab and Caviar – easy, low-carb and a bit special

Bean Bourguignon (incredibly like the meaty version!)

Celeriac Remoulade aka Andrew’s favourite salad (and just 5 or 6 ingredients)

Carrot and Celeriac Soup – it’s one of my very first recipes but a recipe I still make today

What’s in this Roasted Celeriac?

The list is gratifyingly short for something that tastes so good, and is so easy to prepare.

One large celeriac, or two smaller ones. The weight isn’t very important, but about between 800 grams and 1 kilo, or so is good. This recipe is very flexible.

Extra virgin olive oil or extra virgin rapeseed oil. About 2 tablespoons, to heat in the tray.

Fresh rosemary and thyme leaves

tossing the roasting celeriac pieces on baking tray

tossing the roasting celeriac pieces on baking tray before roasting then adding the flavours halfway through

Garlic and shallots. You could use onion in a pinch.

Coarse corn meal or polenta. This is optional, but gives a bit of crunch. Roasted celeriac, because it lacks the starch of potatoes, will not get crispy bits. But the edges do get toasty and nicely chewy. In a good way!

Salt and pepper. I use a little San Francisco Salt Co lemon and rosemary salt (highly recommended if you are in the US). Maldon salt or similar is always better than regular table salt.

You can also add some grated parmesan or vegan hard cheese right at the end of roasting.

cauliflower wellington decorated with herbs on platter

Why not serve your roasted celeriac with my Cauliflower and Porcini Mushroom Wellington?

What to serve with your Roasted Celeriac

Celeriac parmentier/roasted celeriac is a fab side dish for any weekday dinner. We recently had it with a gorgeous wintry salmon dish I will be sharing very soon over on my Instagram. But it would be especially welcome at an omnivorous or vegetarian festive meal, such as Thanksgiving or Christmas. Why not try it with a quality nut roast, lentil loaf or something like my Cauliflower & Porcini Mushroom Wellington?

serving celeriac parmentier

close up of roasted celeriac on green and white vintage platter with spoon
4.73 from 11 votes

Celeriac Parmentier

Diced and roasted celeriac with plenty of rosemary and garlic, this is a lower carb alternative to delicious potatoes parmentier or roast potatoes. Perfect for a midweek dinner or the holiday table.

Course Side Dish
Cuisine French, Vegetarian
Keyword celeriac, roasted vegetables
Prep Time 10 minutes
Cook Time 35 minutes
Total Time 45 minutes
Servings 4 servings
Calories 153 kcal
Author kellie anderson


  • 1 large celeriac well washed, trimmed, peeled and cubed about 1 cm dice
  • 2 tbsp extra virgin olive oil more as needed
  • 2 tbsp rosemary leaves chopped
  • 1 tbsp thyme leaves optional
  • 5 cloves garlic bashed, peeled and minced
  • 2 eschallots peeled and sliced
  • 1 tbsp coarse corn meal or polenta optional but adds nice crunch
  • salt and pepper
  • parsley chopped; to garnish


  1. Pour the oil on a baking tray and place in a 190C fan/210C/420F oven to heat up for 5 minutes.

  2. Remove the tray and add the celeriac cubes, tossing carefully with two heatproof spatulas. Roast for 20 minutes.

  3. Remove and sprinkle on everything but the parsley. Toss around and return to roast a further 15 minutes.

  4. Serve hot or warm with chopped parsley. Enjoy!!

Recipe Notes

Reheat-friendly: This dish can be reheated or made ahead. To do so, slide your tray in the oven and heat to 190C/175C fan/375 F. Remove the tray when it is hot, and pour on the roasted celeriac, heating up for 5-8 minutes.

Variation: add grated parmesan or other strongly flavoured hard cheese for the final five minutes of roasting. Or, you can just toss it through when you take it out of the oven and into a serving dish.

Nutrition Facts
Celeriac Parmentier
Amount Per Serving
Calories 153 Calories from Fat 72
% Daily Value*
Fat 8g12%
Saturated Fat 1g6%
Sodium 164mg7%
Potassium 529mg15%
Carbohydrates 19g6%
Fiber 4g17%
Sugar 3g3%
Protein 3g6%
Calcium 105mg11%
Vitamin C 18mg22%
Vitamin A 135IU3%
Iron 2mg11%
* Percent Daily Values are based on a 2000 calorie diet.



Pin now. Make soon!

roasted celeriac parmentier pinterest

10 thoughts on “Roasted Celeriac with Rosemary and Garlic (parmentier-style)

  1. Mr A says:

    Who would of thought that the food of the gods (potatoes) could be bettered?!!!! You’ve done it again Foodtoglow.

  2. Ann says:

    This is really good, I was fortunate enough to eat it with Kellie yesterday and will certainly be making it.

  3. Rachel says:

    The most humble and understated of vegetables is elevated into an elegant winter centerpiece, just lovely

  4. Yummm! Excellent pictures, my friend. I should try your recipe one of these days. I have never heard about celeriac before. But I love turnip, so I am sure I would enjoy celeriac. They seem to be related. Thanks so much for sharing. Keep shooting!

  5. Lovely recipe, Kelly, and something I can use right now, as my husband is still on his weight loss program. Thank you!

  6. How delicious! I actually cant wait to make it, sounds wonderful and as always lovely photos & instructions 🙂

  7. David SOLOMON says:

    this is really

  8. Chelvi S says:

    I have seen celeriac but never tried it. Thanks for the recipe I will be making this soon – great recipe.

  9. Lisa says:

    Have cooked this a couple of times after never eating celeriac in my life before. It’s a great alternative to potatoes. I get a fruit and veg box delivery every weekend and twice, this weird looking vegetable was included – haven’t tried any other recipes with it yet. Can recommend this though 🙂

    1. kellie anderson says:

      Sorry for the late reply to your comment, Lisa. Thanks so much for your brilliant feedback. It is something I make throughout the colder months as a reliable side dish. I’m really happy that you made it and took the time to leave such a great review 🙂

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