Golden and crispy outside, tender inside, these keto roasted potatoes are purple radishes in disguise, at 0.4g net carbs per serving. I toss the diced radishes with olive oil, salt, and pepper, spread them on a lined tray, and I roast at 400°F for 23 to 25 minutes. Rosemary or thyme goes in when I want them herby.
I never thought I'd be the person raving about radishes. Raw, they're peppery and sharp. Nothing like a potato. But I roasted a batch back in 2018 on a whim, and everything changed. The bitterness disappeared, the texture softened, and what came out of my oven looked and tasted like roasted red potatoes.
These have become a staple in my house. I make them at least twice a week, sometimes more when I'm meal prepping. They come out warm, crispy on the edges, and savory all the way through. I love them as a side for dinner, but I eat them for breakfast too, right alongside bacon and eggs. My kids think they're eating red potatoes, and I'm not correcting them.
The recipe is simple on purpose: olive oil, salt, pepper, a hot oven, and the full 23 to 25 minutes. That last part is the whole trick, and I explain why below. When I want something indulgent, I go the loaded route with bacon, cheddar, ranch, and sour cream. My family fights over that version. If you're missing potatoes on keto, my mashed turnips are the creamy side of the same swap.
Which radishes work best?
I use purple radishes here because they look the most like red potatoes when roasted. But I’ve also made these with daikon radishes, which work well if you want larger pieces. Daikon is milder in flavor and the cubes hold up at high heat. Turnips, celery root, and rutabaga are other root veggies I’ve tried, but radishes win every time for that authentic potato look and texture.
How to roast radishes (oven and air fryer)
Dice the radishes into even pieces (I go about 3/4 inch cubes), toss with olive oil, salt, and pepper, then bake at 400 degrees for 23-25 minutes. Pulled early, they taste too radish-y. The full time makes all the difference. Radishes have more water than potatoes, so they need that time to dry out and crisp up properly. Don’t crowd the pan either. I spread mine in a single layer with space between each piece, and use two sheet pans if I’m making a double batch.
I’ve also started making these in the air fryer. 380 degrees for 15-18 minutes, shaking the basket every 5 minutes. The edges get even crispier than the oven version. I don’t crowd the basket either, and I do two batches if I need to, because airflow is everything. Smaller batches though, so I use the oven when I’m feeding my whole family. Stovetop in a skillet works too if you want a quick sear.
What do roasted radishes taste like?
Raw radishes taste peppery and sharp. I remember the first time I bit into a raw one thinking it would taste like a potato. It did not. But cooked, they mellow out completely. Mild like a turnip, with a texture close to the real thing. They absorb whatever seasonings you add, so I rotate between rosemary and garlic, parmesan with Italian herbs, and sometimes just a simple seasoned salt. Fresh herbs work better than dried in my experience, but either is fine.
Should you peel radishes before roasting?
Either works. I leave the skin on because it saves time and the purple radishes look more like red potatoes that way. I’ve tried peeling them and honestly couldn’t tell much difference in the final result. The skin crisps up nicely in the oven, so I say skip the extra step.
How to season them (plus the loaded version)
This is a simple base recipe, but I dress it up all the time. My favorite upgrade is the loaded version: crumbled bacon, shredded cheddar, a drizzle of ranch, and a dollop of sour cream. I pop the pan back in the oven for 2-3 minutes to melt the cheese. Loaded roasted radishes are unreal. For a lighter option, I toss them with fresh rosemary and grated parmesan right out of the oven. Basil and thyme work too. For a parmesan crust, I sprinkle grated parm over the tray in the last 5 minutes and let it get golden.
For the crispiest version I’ve found, I smash them. Par-roast for 20 minutes, pull the pan, press each radish flat with the back of a fork, then broil for 5-6 minutes until the edges char. The smashed version gets crunchier than straight roasting. I also sometimes toss them in crushed pork rinds and parmesan before baking for a crunchy coating that rivals bread crumbs.
Store raw radishes in an airtight container in the fridge for up to 3 days. I don’t recommend freezing because the high water content makes them mushy when thawed (I learned that the hard way). Roasted radishes keep well in the fridge for 3-4 days. I reheat mine in the oven at 400 degrees for about 8-10 minutes to get the crispiness back. The microwave works in a pinch but you lose that crispy edge.
Are radishes low carb?
At just 1.8g net carbs per 100g, radishes fit easily into a keto diet. I track my macros pretty closely and these never cause issues. They’re also packed with vitamin C, B6, potassium, and fiber. Lots of nutrition for very few carbs. I eat them multiple times a week without worrying about my daily totals.
More keto sides I love
Need more keto sides in your rotation? Here are some I make all the time:
Add diced radishes, olive oil, salt and pepper to a ziploc bag or bowl. Toss to evenly coat.
2
Spread onto a tray
Evenly spread radishes onto a parchment paper or foil lined baking tray.
3
Bake them
Bake the radishes on the sheet pan at 400 degrees for 23-25 minutes.
Nutrition
Per serving: 1/6 of the batch
Calories
83
Fat
9g
Protein
0.1g
Total carbs
0.7g
Net carbs
0.4g
Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.
Frequently Asked Questions
Why do my roasted radishes still taste peppery?
They came out early. Radishes hold more water than potatoes, and the raw bite only disappears with enough heat and time. Give them the full 23 to 25 minutes at 400 degrees, spread in a single layer so they roast instead of steam, and use two pans for a double batch. In the air fryer, 380 degrees for 15 to 18 minutes with a shake every 5. If they're soft but still sharp, they needed longer.
Can I use daikon radishes instead of purple radishes?
I've made this with daikon radishes several times and they work well. Daikon is milder in flavor and the pieces are larger since the root is bigger. I cut daikon into 1-inch cubes and roast them about 5 minutes longer than purple radishes. The texture comes out great, though they don't have that red potato look that purple radishes give you.
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Made these last week, came out tasty but nowhere near as golden as your photos. Had them at 400 for the full 25 minutes. Should I push to 30, or would bumping the temp get more color without drying them out?
Spent two days avoiding this because I was sure radishes would still taste like radishes no matter how long you roasted them. 23 minutes at 400 proved me wrong. Crispy edges, soft inside, zero sharpness. I did go heavier on the salt than the recipe says and liked it better that way.
Doubled it from day one because six servings lasting a week seemed wishful, and yeah, I was right. I portion them out Sunday night and they hold through Thursday with actual texture, which I didn’t expect from something that’s mostly water. Been throwing fresh rosemary in the bag before tossing since the second batch. The smell when it hits the oil in the oven is ridiculous in the best way.
Add parmesan in the last two or three minutes, just a couple tablespoons scattered across the tray. It catches on the radish edges as they finish browning and forms this savory crust. That’s when the potato illusion actually lands. I don’t skip it.
Dina, the potato illusion landing is the whole point. I’ve been going in at 5 minutes but two or three sounds like it gets crunchier. I’m stealing that.
Salt the radishes and let them sit 10 minutes before oiling, then pat dry. Got maybe a teaspoon of water off the surface, and the crust on my second batch was noticeably crisper. Cut size matters too. I went smaller than the recipe photo, closer to half-inch cubes, and more of each piece got that caramelized exterior instead of a soft center. Also threw in smoked paprika with the salt and pepper. Deeper color, more flavor. Timing note: 23-25 minutes was short in my oven. 27 gave real bite at the edges. Four out of five on the timing instructions.
I’ve done the pat-dry but not the 10-minute sit first, and that probably explains the crispness gap. Smoked paprika really works. The color goes from pale to almost blistered at the edges.
83 calories caught me off guard, because the serving ends up being a real amount of food. Added minced garlic to the olive oil before tossing, probably more than I should have, and it crisped up between the radishes. Total accident that it worked. Doing this every time.
Bought radishes just for this and let them sit on my counter for three days because I was not convinced. Finally roasted them Sunday and those crispy golden edges at 23 minutes totally won me over. Do leftovers reheat with any crispiness or is fresh the only way?
Three days of counter skepticism to 23-minute convert. For leftovers, the oven gets you most of the crisp back. 400 on a sheet pan, 8-10 minutes, no cover. Air fryer is even better. 380 for 5 minutes and it’s almost fresh. Microwave just steams them into mush.
Made these probably six times now, and I finally tried adding fresh rosemary like the recipe suggests. The difference is real. The leaves get a little crispy while the radishes roast and there’s this savory, herby smell when you open the oven that catches you off guard. Going with fresh over dried from here on out.
My 9-year-old scrutinizes everything I put on the table, so I served these without a word. He ate his portion, went back for what was left on the dish, and then asked at breakfast the next morning if we were having the ‘crispy potato things’ again. Still haven’t told him they’re radishes. At 400 degrees they come out golden and a little caramelized at the edges, and I think that’s the detail that sold him.
This is probably my sixth or seventh batch of these since I stumbled on the recipe. What keeps me coming back is how they look coming out of the oven, that deep golden color you would swear you were looking at actual red potatoes. I’ve started pushing them to about 27-28 minutes instead of 25 and the edges get a little more bite that way, which I prefer. Small thing I picked up over a few rounds, but worth trying if you haven’t.
My husband is a potato person, like genuinely cannot eat a meal without them, and I’ve been struggling to find something that works since we started cutting carbs. He walked in while these were in the oven, saw them on the sheet pan, and said nothing except ‘oh good.’ Didn’t ask what they were. Just ate them. Found out halfway through that they were radishes and his response was ‘these are better than regular potatoes though, what do you put on them.’ I roasted mine the full 25 minutes at 400 and they came out exactly right, crispy outside and not mushy at all. Would have been five stars but I think next time I’m adding rosemary because now I’m curious.
‘These are better than regular potatoes’ from a potato person is the best possible outcome. Rosemary in with the olive oil before they go in, not after. It gets a little crispy on the radishes and that’s where the flavor is.
My husband catches every keto swap I try, and these got zero pushback. He even asked me to make them again for Easter dinner next week. Radishes just became a permanent grocery list item.
Two weeks into keto and honestly, missing potatoes has been way harder than I expected. My husband is super picky, so the whole ‘family thinks it’s real potatoes’ thing has me excited to try this. Only problem is I was planning to make it this week and realized I’m basically out of olive oil. I do have a big bottle of avocado oil though. Would that work just as well for getting the radishes crispy, or does it really need to be olive oil? Still pretty new to this and I can never tell when swapping oils actually matters.
I was skeptical at first but I made these in my air fryer with a little bit of salt and pepper and a little olive oil spray and they came out fantastic, totally tasted like potatoes.
I made these on a Sunday and did not tell my husband what they were. He ate two helpings and then asked me which potatoes I used because they were ‘so crispy.’ I told him they were radishes and he looked at me like I had broken a law. He’s been skeptical about every keto swap I’ve tried this year, so watching him sit there processing that information was honestly the best moment I’ve had in this kitchen in months. The outside gets genuinely golden and almost crackly at 25 minutes, not soft or strange like I was afraid of with a vegetable I’d never cooked before. Double batch next weekend, and this time I’m telling him what they are beforehand just to see if it changes anything.
Tried these in bacon drippings instead of olive oil. The difference is insane. That smokiness with the crispy edges at 25 minutes, I’m not going back. Got bacon fat in your fridge? Use it.
Bacon drippings completely changes it. That smoky fat gets into every edge and you get this almost bacon-potato situation happening. I keep a jar in the fridge now for exactly this.
I’ve done turnips, I’ve done jicama, tried a cauliflower version that was fine but felt like a compromise. These radishes roasted at 400 for 23 minutes are a completely different situation (golden outside, actually tender inside) and I keep coming back to how 0.4g net carbs per serving doesn’t feel real.
I was skeptical about the radish swap. I’ve tried a few cauliflower-based potato substitutes and they always carry this unmistakable brassica aftertaste that breaks the illusion no matter what you season them with. Radishes are peppery raw, so I figured roasted would be worse, not better. I was wrong. At 400 degrees, something happens around the 20-minute mark where the outside develops this golden crispiness that looks and behaves exactly like a roasted red potato, and the inside goes completely tender without turning to mush. I made a batch alongside a pot roast Sunday dinner and set them out without saying anything. My wife loaded hers with sour cream before I could tell her what she was eating. That settled it.
The sour cream move before you could say anything. That’s the whole review right there. You’re right about cauliflower too, the brassica thing doesn’t go away no matter how long you roast it.
These are legitimately crispy and the texture is there, but the radish flavor doesn’t completely disappear at 25 minutes the way the recipe implies. Smaller dice and pulling at 18-20 made a real difference for me. Still making them, just wish that note was in the original recipe.
