28th July 2021
Sweet potato fries make a delicious, colourful alternative to potato wedges or french fries, with more nutritional value too.
The best frozen sweet potato fries come out bright orange, with crunchy outsides and fluffy middles, and a sweet, deep flavour. But we found disappointing fries in our tryout, with some brands’ chips coming out bland, mushy and looking unappealing on your plate.
Our panel of consumers compared frozen sweet potato fries from leading brands McCain and Strong Roots to own label options from Aldi, Lidl, Tesco and more in October 2020. Just one had a nice enough flavour, texture, aroma and appearance to be made a Best Buy.
Only logged in Which? members can view the rest of our results and tasting notes below. If you're not yet a member, you'll see an alphabetically ordered list of the frozen sweet potato fries on test.
All prices correct as of 30 November 2020.
29p per 100g
Aldi’s fries are the cheapest on test, so they could make a great addition to a budget-friendly weeknight dinner. Are they as good as, or better, than the pricier options?
35p per 100g
There’s a long list of ingredients going into Asda’s sweet potato fries (the joint-longest list of those we tested). Ingredients include paprika and onion powder.
50p per 100g
Co-op’s frozen sweet potato fries are low on calories, salt and fat compared to others we tested, but you’d hope they’d be high on flavour.
Want to buy without reading our results? Available from Co-op stores only.
33p per 100g
When it comes to frozen food, Iceland should know what it’s doing, but has it got its frozen sweet potato fries just right?
39p per 100g
Lidl is always cheap as chips, but are its sweet potato fries a bargain, or are you best off paying a little more?
Want to buy without reading our results? Available from Lidl.
50p per 100g
M&S sweet potato fries have the fewest calories of any brand. Does this mean a compromise on flavour, or are they a tasty lighter option?
52p per 100g
McCain is probably one of the first brands you think of when it comes to potatoes, but how good are its sweet potato fries?
46p per 100g
Sainsbury’s sweet potato fries have the most amount of calories of all the chips we’ve tried, but it might be worth it for a truly tasty side dish.
59p per 100g
These branded sweet potato fries are the most expensive of the lot, but are they really worth the extra money
46p per 100g
Tesco claims its seasoned batter results in ‘extra crispiness’ on its sweet potato fries. But what did our tasters think?
50p per 100g
Waitrose frozen fries are low on calories but high in fibre compared to others we tested, so they’re a good choice for those after nutritional value. But how do they taste?
Looking to make the healthiest possible choice at dinner time? You’ll have to choose M&S frozen sweet potato fries. They contain less than half the calories, fat and saturated fat than the Sainsbury’s ones.
Although Sainsbury’s fries have the highest calorie count, they also have more protein and fibre per 100g than other brands we tested, so could be a good choice for those looking to pack nutritional value into their burger and fries meal.
Those watching their salt intake may want to avoid the Aldi fries - they have by far the most salt of all the brands we tried.
If you’re choosing sweet potato fries as a healthy alternative to standard chips, you might be surprised by their calorie count. We compared these frozen sweet potato fries to the we tested in February 2020, and, on average, there’s not much to separate them on calories.
However, you should pick sweet potato fries if you’re looking for more fiber in your diet. They contain more than twice as much as the average oven chip.
Cooking times vary depending on the brand you buy. Sainsbury’s fries take the longest (up to 30 minutes) whereas Tesco’s can be ready in just 16.
All the sweet potato fries need a hot oven (at least 200 degrees) and most instructions recommend turning them over halfway through for the best results.
Some fries, such as Sainsbury’s and Iceland, can be deep fried. This is a quicker way to cook - your side dish will be ready in just two to five minutes, just enough time to fry your steak - and it will bring out a deeper flavour and crispier texture too. It’s far less healthy than oven cooking though.
Although our testing found some sweet potato fries are better than others, none really wowed on flavour. With that in mind, you might be best off making your own seasoning to add to the fries before cooking.
A good start is to coat your fries in olive oil, salt and pepper. For something a little extra, you can enhance the natural sweetness with honey, or add smokiness and heat with paprika and cayenne pepper. Most of the sweet potato fries we tested have onion and garlic powder in the coating, but you could add more to really bring out those flavours.
The products were assessed by a large panel of consumers who regularly buy and consume sweet potato fries.
The make-up of the panel broadly represents the demographic profile of adults in the UK.
Each frozen sweet potato fry brand was assessed by 62 people.
The panellists rated the taste, texture, aroma and appearance of each product and told us what they liked and disliked about each one.
The taste test was blind, so the panellists didn’t know which brand they were trying. The order they sampled the frozen sweet potato fries was fully rotated to avoid any bias.
Each panellist had a private booth so they couldn’t discuss what they were tasting or be influenced by others.
The overall score is based on:
These weightings are based on consumer rankings of the importance of different frozen sweet potato fries attributes.