These Thyme Roasted Radishes and Onions are a delicious low carb alternative to potatoes! The olive oil, garlic, and fresh thyme take this easy side dish to a whole new level.

Now that my husband is all about the Keto lifestyle, I’ve had to start getting creative with our sides! I love me some potatoes and starchy carbs, but unfortunately those are “no-no’s” on the Keto diet. Radishes are an amazing low carb alternative to potatoes that still get that crispy outside and creamy inside. Roasting them brings out an entirely different flavor compared to when they are eaten raw. And, combined with the roasted onion – MMM it’s just too good! Ok, I’ll stop now – just trust me when I say these thyme roasted radishes with onions are GOOD.

Are radishes good for you?

Yes! Incredibly good for you. They can help to boost immunity, aid in digestion, and are packed with potassium, calcium, sodium, Vitamin C, B-vitamins, folate, and minerals like iron, magnesium, and zinc. You can check out this article to learn more about the health benefits of radishes!

You could also use rosemary in place of thyme if that’s what you have on hand. It will change up the flavors slightly, but it will still be delicious!

Looking for other low-carb Whole30 side dishes? Check out this Dairy Free Cheesy Broccoli Casserole or Creamy Cilantro Lime Coleslaw!

Ok, let’s get cookin’!

Thyme Roasted Radishes and Onions

A delicious low carb savory side dish - roasted radishes and onions with olive oil, sea salt, garlic, and fresh thyme!
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  • 1 lb radishes
  • ½ large onion
  • 2 tbsp olive oil
  • 2 cloves minced garlic
  • 1 tsp sea salt
  • 1 tbsp fresh thyme , plus more for garnish


  • Preheat oven to 425. Line a baking sheet with parchment paper. Wash your radishes and cut off stems/leaves. Slice each one in half, and in half again if they're very large. Place into a bowl. Cut onion into 1/2 inch-1 inch pieces and add to the bowl, along with the olive oil, garlic, salt, and thyme. Use hands to mix well.
  • Spread the radishes and onions out onto the baking pan evenly. Roast for 25-30 minutes until fork tender, flipping halfway through. Enjoy with your favorite protein!


Calories: 92kcal, Carbohydrates: 7g, Protein: 1g, Fat: 7g, Saturated Fat: 1g, Polyunsaturated Fat: 1g, Monounsaturated Fat: 5g, Sodium: 627mg, Potassium: 308mg, Fiber: 2g, Sugar: 3g, Vitamin A: 92IU, Vitamin C: 21mg, Calcium: 43mg, Iron: 1mg