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Tuscan Sweet Potato Fries

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A fuss-free recipe for deep-frying sweet potato fries. Golden crisp on the outside and tender on the inside, seasoned with Italian herbs and garlic.

Tuscan Sweet Potato Fries with Sage

I blame Nigella for this recipe, and many apologies to all of you who make these sweet potato fries.

They are worse than a full bag of peanut M & M’s. There’s no way to possibly eat just one.

If you’re ready, then go all in. Fair warning.

But just so you know where I stand on this topic – GO ALL IN.

I was teased into indulging in these dark, dense brownies thanks to Nigella’s book, after which I couldn’t help trying her method for making Tuscan fries.

Tuscan Sweet Potato Fries

She credits Cesare Casella, a chef originally from Lucca, for inventing Tuscan Fries.

They are potatoes deep-fried with aromatic herbs (rosemary, sage, thyme) and whole garlic cloves.

Sounds delicious, right?

But what really got me interested in the recipe was the method Nigella adapted from Cook’s Illustrated.

How to make easy deep-fried French fries

It’s described as a “revolutionary” fuss-free way to deep-fry.

The method involves starting the potatoes in cold oil, then heating it to a rapid boil.

The potatoes end up frying to perfection in about 25 minutes.

Tuscan Sweet Potato Fries with Sage

I don’t like messing with deep-frying usually, but I became very curious and decided to give it a go.

I didn’t have any of the waxy potatoes called for in Nigella’s recipe, so I forged ahead with a few sweet potatoes instead.

I also decided not to use corn oil, which the recipe suggests.

For both health and flavor reasons, I do my best not to cook with ultra-processed vegetable oils.

It’s olive oil or nothing for the most part (well, except for really good butter and the occasional fling with duck fat, which also makes killer fries).

However, I saved the extra-virgin oil for another day and used a “light” olive oil, which I’m afraid after reading the excellent book Extra Virginity is just as scandalously corrupted and impure as a tanker full of cheap soybean oil.

But what the hell. At some point you have to just move on and start frying.

Which I did, and I’m pleased to report that the recipe worked like a charm.

The sweet potatoes emerged dark and crisp and were perfectly tender on the inside.

Tuscan Sweet Potato Fries

The crunchy bits of fried herbs shatter into tiny shards that coat the potatoes, giving every mouthful a taste of them.

The garlic slips out of the skin, golden and soft; just right for squeezing out onto the sweet potatoes for even more flavor.

I had some smoked salt and sprinkled some of it over everything, which kind of took it over the top into sweet potato fantastic-ness.

One more great thing – save the oil. It’s aromatic with herbs and garlic, and it’s good for cooking other food.

I measured the oil after cooking as Nigella describes in the recipe introduction, and recovered almost exactly all of it.

So cold-start deep frying might not be such an indulgence after all.

Tuscan Sweet Potato Fries with Sage

Tuscan Sweet Potato Fries

Karen Tedesco
Foolproof deep-frying? Yes, it's possible! These Tuscan Sweet Potato Fries are golden and crisp on the outside and tender on the inside, seasoned with Italian herbs and garlic. 
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5 from 1 community review
Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Course Appetizers
Cuisine Italian
Servings 6 servings


  • 3 (850 g) medium sweet potatoes (about 1 ¾ pounds)
  • 1 ½ quarts (1.5 l) olive oil (not expensive extra-virgin)
  • 1 head of garlic, separated into cloves (unpeeled)
  • Handful each rosemary, sage and thyme sprigs
  • Smoked sea salt, kosher or sea salt


  • Trim off the ends of the sweet potatoes (no need to peel them), stand them on end and slice down vertically into ½-wide planks, then into ½-inch wide fries. If the potatoes are longer than 4 inches, cut the slices in half.
  • Put the sweet potatoes in a wide, heavy pot (I used a 4-quart casserole pot 10 inches in diameter and 4 inches deep). Cover with the oil, place over high heat and bring to a boil. It should take about 5 minutes.
  • Once the oil is bubbling vigorously, set a timer for 15 minutes. Use a deep-fry thermometer to adjust the heat if needed, keeping the oil somewhere between 275 and 300 degrees.
  • After 15 minutes, carefully move the sweet potatoes around with a pair of long tongs to mix them around a little. Add the garlic cloves and continue frying for another 5 or 10 minutes, keeping your eye peeled that neither the potatoes or garlic gets too dark.
  • Test a fry —carefully— for doneness. If they are golden and crisp and tender on the inside, toss in the herbs (stand back while you do this in case of splatters) and fry for another minute or so.
  • Use a slotted skimmer to transfer everything to a towel-lined baking sheet. Blot briefly and sprinkle with salt. Serve right away.

Karen's Notes and Tips

A deep fry thermometer is highly recommended.
Recipe inspired by Tuscan Fries in Nigellissima


Serving: 1g | Calories: 275kcal | Carbohydrates: 23g | Protein: 2g | Fat: 23g | Saturated Fat: 17g | Sodium: 67mg | Potassium: 381mg | Fiber: 3g | Sugar: 5g | Vitamin A: 16031IU | Vitamin C: 3mg | Calcium: 36mg | Iron: 2mg

Nutrition facts are calculated by third-party software. If you have specific dietary needs, please refer to your favorite calculator.

Did you make this recipe? Search @Familystylefood or tag #familystylefood on Pinterest

Hey, I’m Karen

Creator of Familystyle Food

I’m a food obsessed super-taster and professionally trained cook ALL about creating elevated dinners with everyday ingredients. Find simplified recipes made from scratch and enjoy incredibly tasty food! Read more about me here.

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  1. I just started following you today when I saw you on food gawker! I love sweet potato fries, so I’ll definitely be making these soon!


    1. I’m with you, Laura! These surpassed my expectations and definitely worth it.

  2. Hi Karen,

    Oh, Cesare Casella, Nigella and you. I’ll just spread the blame equally. How’s that? I can just see Chef Casella with sprigs of rosemary, sage and thyme in the pocket of his chef’s jacket. These things must be deadly – but I mean that in the nicest way. I can not wait to make them. I adore sweet potato fries.

    I am enjoying Nigella’s book. I think this is my favorite one. What do you think?

    As always, your photography is both awe and envy inspiring. Complimenti, amica!

    1. Grazie, Adri – your comment made me smile.
      I remember seeing an image of chef Casella with the herb sprigs peeking out of his pocket – or did I dream that up? Either way, it’s a fabulous idea to scent oneself with fragrant herbs. I’ll take that over a splash of Acqua di Gioia any day.
      This Italian-inspired book of Nigella’s is coming very close to surpassing my up-until-now favorite How to Eat, my introduction to her articulate, engaging voice and very personal cooking style. Also, my kids were babies at the time and her writing on feeding children real food was a comfort to me in a world of chicken nuggets.

    1. Sylvie, thanks! They are wonderful – I hope you give them a try.

  3. These fries look incredible! I am thrilled you didn’t have any waxy potatoes on hand because I am such a huge fan of sweet potato fries. Your photos are absolutely stunning!

    1. Hi Emily – Yes, it turns out that I’m glad I didn’t have regular potatoes either! Something magical happens to the sugars in sweet potatoes when they’re deep-fried, making them taste almost candied. Thank you for your kind words.

    1. Thanks Carol. I love sweet potatoes in just about any form, too. The garlic and herbs do make these really great!