Roasted radishes stand in for potatoes in this creamy keto potato salad, at 1.8g net carbs per serving. I roast the quartered radishes at 350°F for 15 to 20 minutes to mellow them, and I let them cool before they meet the dressing of mayo, dijon, chopped pickles, capers, and lemon. Hard boiled eggs finish it like the classic.
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. The pickle juice is what 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.
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.
The finished salad: roasted radishes, hard boiled eggs, capers, red onion and parsley in the dressing.
Why Your Salad Might Turn Pink
Purple radishes will turn the salad pink. Peel them first, or use daikon radish instead. Roasting also bleeds less color than boiling, which is one more reason I stick with the oven.
Things I Like to Add
Try adding:
Bacon
Avocado
Celery
Chives
Dill
White wine or red wine vinegar
Paprika
How to Make Faux-tato Salad with Roasted Radishes
The whole process takes about 25 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 ratio is one cup mayo, a quarter cup dijon, and two tablespoons of pickle juice. 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.
In a ziploc bag, add radishes, a splash of olive oil, and salt & pepper. Close the bag and rub or shake to mix together.
4
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.
5
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.
6
Toss
Add the roasted radishes and eggs. Mix together. Season with salt and pepper to taste.
7
Serve
Serve and enjoy!
Nutrition
Per serving: 1/8 of recipe
Calories
302
Fat
30.2g
Protein
3.8g
Total carbs
2.9g
Net carbs
1.8g
Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.
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, and everything in the dressing is already keto friendly, so the radish swap does all the work.
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 make this ahead of time?
Yes, and I actually think it tastes better the next day. The pickle juice and mustard soak into the radishes overnight and the flavors meld together. It keeps in my fridge for 3-4 days without getting watery, because roasted radishes don't release moisture the way boiled potatoes do, so the dressing stays thick. I just stir it and add fresh parsley right before serving.
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?
Fully mixed overnight works. The radishes don’t release moisture the way boiled potatoes do, so the dressing stays thick instead of turning watery. Mix it Friday night and skip the car assembly. The pickle juice mellows by Saturday and it actually gets better.
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.
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.
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 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.
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.
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.
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.
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.
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.
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.
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.
I made this for the first time. It’s absolutely delicious! I will make this again & again. I used boiled daikon instead of radishes. & I can’t even tell that it’s not real potato salad. It’s a wonderful recipe. Thank you!!!!
