Thyme-Roasted Radishes and Onions – Whole30 & Keto Side Dish

These thyme-roasted radishes and onions make a flavorful low‑carb alternative to potatoes. Olive oil, garlic, and fresh thyme elevate this simple side into something special.

Since my husband embraced a keto lifestyle, I’ve been experimenting with side dishes that feel satisfying without the starch. Radishes work wonderfully as a low‑carb stand‑in for potatoes: when roasted they develop a crisp exterior and a tender, almost creamy interior. Roasting also mellows their peppery bite and brings out a sweeter, nutty flavor. Paired with sweet, caramelized onions and bright thyme, this dish becomes a savory, comforting side that complements any protein.

Are radishes good for you?

Yes — radishes are nutritious and low in calories. They offer vitamin C, several B vitamins including folate, potassium, calcium, magnesium, and trace minerals such as iron and zinc. They also support digestion and immune health thanks to their fiber and antioxidant content.

If you don’t have thyme on hand, rosemary makes a fine substitute. The flavor will shift slightly, but the result will still be delicious.

Ready to cook? Here’s the recipe.

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Thyme Roasted Radishes and Onions

By: Mary Smith

Prep: 5 mins

Cook: 25 mins

Total: 30 mins

Yield: 4 people

A savory, low‑carb side: roasted radishes and onions tossed with olive oil, sea salt, garlic, and fresh thyme.

Ingredients

• 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

Instructions

• Preheat the oven to 425°F (220°C). Line a baking sheet with parchment paper. Wash the radishes, trim the stems, and halve each radish (quarter large ones). Place the cut radishes in a bowl. Chop the onion into ½–1 inch pieces and add to the bowl along with olive oil, minced garlic, sea salt, and fresh thyme. Toss with your hands so everything is evenly coated.
• Spread the radishes and onions in a single layer on the prepared baking sheet. Roast 25–30 minutes, flipping once halfway through, until the vegetables are fork‑tender and lightly browned. Garnish with extra thyme if desired and serve alongside your favorite protein.

Nutrition

Calories: 92kcal
|
Carbohydrates: 7g
|
Protein: 1g
|
Fat: 7g

All nutrition facts are estimates based on typical ingredients and serving sizes. For the most accurate values, weigh your ingredients and divide by the number of servings.