Low Carb Keto Potato Salad
Published July 4, 2019 • Updated July 9, 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
How many carbs are in potato salad?
Traditional potato salad has about 28g net carbs per cup, almost all of it from the potatoes. That is exactly why I gave it up when I first went keto. My roasted radish version has the same creamy, tangy bite at just 1.8g net carbs per serving. Most people who ask are shocked the regular version runs that high.
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.
Making this for a potluck Saturday, trying to figure out how far ahead I can prep. Once the radishes are roasted and cooled, can I mix everything together Friday night, or will they be soggy by Saturday afternoon? With regular potato salad it always tastes better after sitting overnight in the dressing, but no idea if roasted radishes hold up the same way or just go mushy. If the night-before assembly is a bad idea, plan B is roasting Friday and storing everything separately, then combining Saturday morning. Problem is I'm driving about an hour to get there and really don't want to be assembling a salad in the car. Is fully mixed overnight doable with this one?
Good recipe! Only tweak I'd make, cut the mayo to 3/4 cup. A full cup buries the dijon and pickle juice, and you lose that tangy bite. Made it twice before I figured that out.
The dijon and pickle juice need more room than a full cup. Gonna try 3/4 next time.
Gave up potato salad when I went keto. So glad I found this.
had potato salad crossed off. big mistake.
I had it crossed off for too long. Took about six tests before I believed the radishes would actually hold up.
1.8 net carbs. dressing stays thick through day four.
Day four is when it honestly peaks, Kendra. The pickle juice mellows out and the capers kind of sink into everything. I batch this almost every Sunday now. The dijon does most of the work keeping it from breaking, and the radishes don't release moisture the way boiled potatoes do, so you're not fighting a puddle at the bottom of the container. Mine usually makes it to Thursday.
No cauliflower and it actually works?
Roasting the radishes is the whole trick. All that peppery bite cooks out completely, and what you're left with is dense and mild enough that people genuinely don't guess what it is.
old bay on the radishes before roasting. depth I didn't expect.
Old Bay on the radishes before roasting is one of those things I should have thought of myself. Why didn't I think of that. The celery salt in it plays right into the capers and pickle brine already in the dressing. I've done smoked paprika on the radishes before but this is different, more brine-forward. Trying this next batch, probably with a heavier hand than I'd normally do since the dressing is already pretty tangy.
Ok so I'm already planning to make this for a potluck at the end of the month, honestly the radish swap blew my mind. Had no idea roasting them could get that close to actual potato texture. My wife isn't a caper person (she pulls them out of everything), so I need to swap something in rather than skip them entirely. I was thinking a little extra pickle relish since it hits the same briny note, but I have no clue if the ratio goes sideways without them. Would doubling the pickle juice cover it, or is the caper thing more about texture than flavor? And if I leave them out, should I bump up anything else to keep the dressing from falling flat?
Capers are almost entirely flavor in this, the texture barely registers. Extra pickle relish is the right call. I'd add a tablespoon more relish and a squeeze more lemon rather than doubling the pickle juice (too much liquid and the dressing thins out and pools at the bottom). The dijon does most of the flavor work, so it won't fall flat without them.
My sister went back for seconds before I even mentioned the radishes, then immediately photographed the recipe. She catches every keto swap I've tried on the first bite, so watching her not notice was satisfying. I'll bump the pickle juice to 3 tablespoons next time, but otherwise this is exactly what I needed for a summer cookout.
Denise, the sister who catches every swap not noticing is the best possible test result. I bump to 3 tablespoons of pickle juice too when I want more tang - the dressing holds it fine.
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.
Two years of keto mockery and it was radishes. More dijon is right - I usually go closer to a third of a cup.
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?
Make it Saturday. Roasted radishes don't go soft overnight the way boiled potatoes would, so texture won't be an issue. The pickle juice and mustard soak in and the whole thing is actually better the next day. Just stir it and add fresh parsley right before you set it out.
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.