Low Carb Keto Potato Salad
Published July 4, 2019 • Updated March 13, 2026
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I use roasted radishes instead of potatoes and the texture is so close that guests at my last potluck didn't figure it out for five minutes. No cauliflower, no weird aftertaste, just 1.8g net carbs per serving.
I started making this keto potato salad back when I first went keto in 2012, and it took me a while to land on radishes as the swap. Cauliflower was the obvious choice, but it falls apart. Turnips get mushy. Radishes, though? Roast them at 350 for 18-20 minutes and they turn dense, slightly creamy, and completely neutral in flavor. The peppery bite cooks out entirely. If you’ve never tried roasted radishes as a potato substitute, this is the recipe that will convert you.
The trick I wish I’d known from the start: pat your radishes bone dry before you oil them. I learned this the hard way (and a reader named Katie confirmed it). Wet radishes steam instead of roast, and you end up with something soft and sad instead of that firm, slightly chewy texture that sells the whole potato illusion. Paper towel each one, toss in oil and salt, spread them in a single layer, and give them the full time in the oven.
The dressing is where this recipe really comes together. I use mayo, dijon, dill pickles, capers, red onion, and parsley. But here’s what I’ve figured out after making this dozens of times: use four tablespoons of pickle juice, not two. The extra acid makes the dijon and capers actually show up. Without it, the dressing tastes flat. With it, every bite has that tangy punch you remember from the real thing. I keep meaning to update the printed recipe card, so consider this your heads-up.
One of my favorite moments with this recipe was when a reader named Min brought it to a potluck and said nothing about the radishes. Her friend (very much not keto) asked what kind of potato salad recipe she used. It took five full minutes before Min told her. That’s the reaction I’m going for. Not “pretty good for a substitute” but genuinely indistinguishable.
If you want to try a different low carb base, boiled daikon radish gets even closer to real potato texture than regular radishes. I’ve tested both. Daikon is denser and starchier, so it holds the dressing differently. Regular radishes give you more of that waxy red-potato feel, daikon leans toward russet. Both work. And if you’re looking for other keto sides that pull off the same kind of swap, try my keto roasted potatoes (same radish method, different seasoning), keto macaroni salad, or keto coleslaw. I rotate through all of them during summer.
This is also one of my go-to recipes for cookouts because it holds up at room temperature better than most mayo-based salads. The roasted radishes don’t release water the way boiled potatoes do, so the dressing stays thick even after sitting out. Pair it with broccoli cauliflower salad or avocado chicken salad and you’ve got a full spread that nobody will clock as keto.
How to Make Faux-tato Salad with Roasted Radishes
The whole process takes about 30 minutes and most of that is hands-off oven time. I quarter my radishes into chunky pieces (roughly the size of a bite of potato salad), pat every single one dry with a paper towel, then toss them in olive oil and salt. Spread them on a sheet pan in a single layer so they roast instead of steam. I pull mine at 18 minutes, but check at 15. You want them golden on the edges and firm in the center, not soft.
While the radishes roast, I mix the dressing. The key ratio I’ve landed on is one cup mayo, a quarter cup dijon, and four tablespoons of pickle juice (the recipe card says two, but four is what actually makes the flavors pop). Fold in your chopped pickles, capers, red onion, parsley, and lemon juice. Once the radishes cool, toss everything together with diced hard-boiled eggs. Season to taste. This pairs well with just about any grilled protein, or bring it alongside Mexican coleslaw for a cookout spread.
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Ingredients
4 bunches of radishes, diced into quarter chunks -
splash of olive oil
-
4 hardboiled eggs, diced
-
1 cup mayonnaise
-
¼ cup dijon mustard
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¼ cup chopped dill pickles + 2 T juice
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½ cup diced red onion
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2 tablespoons capers
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2 tablespoons chopped parsley
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½ lemon, juiced
-
salt & pepper for flavor
Step by Step Instructions
Step by Step Instructions
Preheat oven
Preheat oven to 350 degrees.
Quarter the radishes
Dice radishes into quartered chunks.
Season
In a ziploc bag, add radishes, a splash of olive oil, and salt & pepper. Close the bag and rub or shake to mix together.
Bake them into 'potatoes'
Spread the radishes out on a baking tray and roast at 350 for 15-20 minutes or until roasted looking. Let cool.
Make dressing
Meanwhile, make the dressing by adding the mayonnaise, mustard, dill pickles and pickle juice, red onion, capers, parsley and lemon juice. Stir together.
Toss
Add the roasted radishes and eggs. Mix together. Season with salt and pepper to taste.
Serve
Serve and enjoy!
Nutrition disclaimer
The nutrition information provided is an estimate and is for informational purposes only. I am a Doctor of Pharmacy (Pharm.D.); however, this content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified health provider before making any lifestyle changes or beginning a new nutrition program.
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Get My Macros + Recipes →Frequently Asked Questions
What does roasted radish taste like in potato salad?
I get this question constantly, and the honest answer is: it tastes like potato salad. Roasting cooks out all the peppery bite, and you're left with something dense, mild, and slightly creamy. I've watched people eat this without knowing, and they don't catch it. One reader told me she ate three radish chunks straight off the pan before they even made it into the salad.
Can I boil the radishes instead of roasting them?
I've tried both. Boiling gives you a softer texture that's closer to a waxy boiled potato, but you lose that golden exterior that roasting creates. If you boil, drain them completely and let them cool before mixing with the dressing. I still prefer roasting because the slightly firm edges hold up better, especially if you're bringing this to a cookout where it sits out.
Can I use daikon radish instead of regular radishes?
I've tested daikon and it actually gets even closer to real potato texture than regular radishes do. Daikon is denser and starchier, so it feels more like a russet potato. Regular radishes lean more toward waxy red potato. Both work, just cut the daikon into similar-sized chunks and roast the same way. A reader named Joy used boiled daikon and said she couldn't tell it wasn't the real thing.
Do radishes turn the dressing pink?
They can, and I've had it happen. Red radishes release a little color when they sit in the dressing overnight. It doesn't affect the taste at all, but if the look bothers you, use white radishes or daikon instead. I've also found that roasting reduces the color bleed compared to boiling, which is another reason I prefer the oven method.
How many net carbs are in this compared to regular potato salad?
My version has 1.8g net carbs per serving. A typical potato salad runs 15-20g net carbs for the same portion. The swap is almost entirely from replacing potatoes (about 15g net carbs per half cup) with radishes (under 1g for the same amount). Everything else in the dressing is already keto friendly.
Can I make a loaded version with bacon and cheese?
I've done this and my family requests it now. Fold in crumbled bacon and shredded cheddar after you mix the dressing and radishes. The bacon adds a smoky crunch and the cheese melts slightly against the warm radishes if you toss them before they fully cool. If you like loaded sides, my loaded cauliflower casserole hits the same notes.
Is this good for meal prep?
I batch this almost every Sunday. It holds up in the fridge for 3-4 days without getting watery, which is something I can't say about regular potato salad. The roasted radishes don't release moisture the way boiled potatoes do, so the dressing stays creamy. I portion it into containers for weekday lunches alongside something like jalapeno popper salad for variety.
Can I prepare this ahead of time for a party?
I make it a full day ahead for gatherings and it's actually better that way. The pickle juice and mustard soak into the radishes overnight and the flavors meld together. Just stir it and add fresh parsley right before you set it out. The dressing stays thick because roasted radishes don't weep like boiled potatoes.
Brought this to my sister's cookout and her husband, who has spent two years making fun of my keto food, cleared his plate before I told him it was radishes. His face when I said it was a vegetable was genuinely worth the drive over. Only thing I'd tweak is a little more dijon next time.
Radishes as potatoes sounded like the kind of keto swap that works on paper but tastes like a science experiment. I've tried the cauliflower version twice and both times it was just... cauliflower salad with mayo. The roasting is what actually saves it. After about 20 minutes they had this soft, slightly firm bite that held up once the dijon and pickle juice soaked in. Taking this to a cookout this weekend and not volunteering any information.
The 'not volunteering any information' test is the real one. Make it tonight if you have time - the pickle juice and dijon really settle in overnight and it tastes completely different than day-of.
Swapped the red onion for scallions and the pickles really came through. Less raw bite competing for attention. Radishes could've used a few more minutes at 350 for my taste, but the dressing balance is solid.
Scallion swap makes sense, the raw onion can overpower everything else. On the radishes, just go longer (38-40 minutes) or bump to 400 for that last push of browning. Either gets you there.
Making this for a cookout Sunday and need to nail the timing. If I roast the radishes Saturday night and mix everything together, will they still have good texture by the next afternoon, or will they go soft sitting in the dressing overnight?
I'll be honest, I was skeptical about radishes. Every time I've seen that sub I assumed it was one of those 'well, it's fine for keto' compromises that doesn't actually fool anyone. But I had four bunches sitting in the fridge after buying too many for a charcuterie board, so I figured I'd try it. The dijon and capers in the dressing are what make this, and once the radishes roast down and cool, the texture actually works. I served this at a spring gathering last weekend and one of my friends (not on keto) was halfway through her second scoop before I told her. She didn't believe me until I showed her the dish. Docking one star only because I'd push the roast time to 22-23 minutes for more color, but that's it.
22-23 for more color works. The friend going back for seconds before you told her is the whole test I run this recipe through.
My grandmother made potato salad every summer for as long as I can remember, big bowls of it for every Fourth of July and family reunion. When I went keto three years ago I quietly grieved that one. I tried the cauliflower versions and they were fine, but they were never that. This is that. The radishes roast down to this soft, almost waxy texture that reads exactly like Yukon golds, and the dijon and capers in the dressing hit that same briny, tangy note I grew up eating. I made it for an early spring gathering and stood there watching people go back for seconds without a single word about what kind of potato this was. My grandmother always put capers in hers too, and that detail nearly made me tear up a little when I realized it.
The caper detail got me. That's the briny backbone of the whole dressing, and your grandmother had it exactly right.
Brought this to Easter dinner and my mother-in-law (who makes her own potato salad from scratch every single year) kept going on about the texture of the potatoes. Waited until she asked for the recipe to tell her it was radishes. Watching her face was worth every second.
The scratch potato salad maker asking for the recipe is a whole different thing. Glad you waited for the ask.
Made this for Easter dinner because I needed a side that could sit next to the real food without looking like a consolation prize. My mom, who is not keto and is pretty vocal about it, loaded up her plate thinking it was regular potato salad. She got halfway through before I said anything. She stopped, looked at her fork, went back for more without a word. That reaction told me more than any recipe review. The capers were my only concern since my kids are suspicious of anything green and round, but I left them in and they didn't say a thing. I'll probably add more dill pickle juice next time because I want the tang to hit harder. Four stars because my roasting time ran short and I had to add almost 10 extra minutes, so I'd just start checking earlier than the recipe says.
Your mom going back for more without a word is better than any five-star review. On the pickle juice, go for it. I'd do a full 3 tablespoons next time. And start checking the radishes around 25 minutes if your oven runs cool.
I've made this four or five times as a spring potluck staple and finally have a tweak worth sharing. Roasting the radishes at 400 for the last five minutes gives you caramelized edges that hold up once the dressing goes on. I also added two stalks of diced celery, and that crunch was what made a few people stop prodding and just accept these weren't potatoes. The dijon and pickle juice ratio in the dressing was unexpected, but it's what makes it taste like real potato salad. This one needs at least four hours in the fridge before serving. The radishes absorb the dressing completely and something clicks around the three-hour mark that just doesn't happen straight out of the bowl.
Celery crunch is what gets the skeptics. Mine come out of the oven looking good but go pale once the dressing hits. The high-heat finish probably fixes that.
I've made this four times and still can't get over what the radishes do in the oven. Went in nervous the first time, came out with something that actually has that soft, potato-like texture I was missing. Capers and pickle juice in the dressing. Really good call. Making a double batch this weekend because there's never any left.
Almost cut the capers while testing. Tried a batch without them and something was just off. Double batch only at this point.
Pat the radishes completely dry before you oil them, trust me on this. First batch came out kind of soggy in spots. Second batch I paper-toweled them and roasted the full 20 minutes and they actually had that dense, slightly chewy texture that sells the whole potato illusion.
The paper towel step is the difference. Should have put that in the recipe.
Went in convinced roasted radishes were a gimmick, pulled them out at 18 minutes, ate three off the pan, and now I'm reconsidering every potato salad I've ever made.
Three off the pan is the real test. If they make it into the bowl I'm impressed with your restraint.
I've made this six times and I'm still surprised every time I take the first bite. The radishes turn into something that has no business tasting like potato salad, but they do, every single time. On batch four I started bumping the pickle juice from 2 tablespoons to closer to 4, and the dressing completely changed. That extra acid makes the capers and the dijon pop in a way they weren't before, at least for my taste. I burn toast, but I keep making this and wanting to tweak it. It's become my default Sunday batch-cook through February.
I usually do four tablespoons, not two. The dijon needs that much pickle juice to show up. I should probably update the recipe.
Used regular yellow mustard instead of dijon since that's what my mom always made her potato salad with. It actually came out closer to the version I grew up eating. The radishes are the real thing though, I kept waiting to taste something weird and it never came. Probably making another batch this weekend, maybe with some celery added in for crunch.
Yellow mustard is what most potato salads are built on anyway. Celery works, I'd throw it in.
Brought this to a potluck and didn't say a word about the radishes. A friend who's very much not keto asked me what kind of potato salad recipe I use. I let it go for a solid five minutes before I told her.
Five minutes, I love that. The texture is what gets people every time. They're looking for it and still can't find it.