Low Carb Keto Potato Salad

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.

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.