These flavorful duck fat roasted radishes with caramelized onions are the perfect potato alternative to a keto and low-carb side dish! Loaded with melted mozzarella and topped with sour cream, the tender roasted radishes make for a colorful spring time accompaniment.
Potatoes are really the ultimate side dish (or rice, depends on whom you ask) because they are simple to cook, cheap, and go well with pretty much everything. Missing these staples is one of the reasons many people find keto and low-carb diets too restrictive. But it isn’t, really. There are two options here:
One, you can forgo side dishes completely. Just have a larger main. That’s what I usually go for. Easy and practical!
Or two, find an alternative food that’s as simple to cook and that can also accompany different dishes, but it is low-carb and keto friendly!
Roasted radishes are an excellent answer to your keto accompaniment dilemma. Easy to cook, budget friendly, and their mellow flavor goes great with anything you can think of!
A keto alternative to potatoes
Radishes are the perfect substitute for potatoes in keto or low-carb diets! One hundred grams of radishes contains only 1.8 grams of net carbs (3.4 grams of total carbohydrates minus 1.6 grams of fiber), and just 16 calories – about ONE calorie per radish!
What?! – you must be thinking – they are made of nothing? Pretty much… They are cute bags of mostly water – and nutrients. The healthy radishes are high in vitamin C, and have smaller amounts of potassium, magnesium, vitamin B-6 and K, niacin, zinc, copper and manganese.
And did you know that radishes are cruciferous vegetables? Although they look nothing like, radishes are from the Brassicaceae family, the same as my beloved cabbage, and also the low-carb and keto darlings cauliflower and Brussel sprouts.
What do roasted radishes taste like
Although roasted radishes don’t taste exactly like potatoes (as I’ve seen claims), they have very similar characteristics. You’d think that they are spicy, as raw radishes have a peppery bite to them. But roasting radishes in a hot oven (or air fryer!) mellows them up, and and they become mild and almost sweet. They also lose their crunch and get very tender and somewhat juicy.
The roasted radishes are bland and take on flavors very well, making them perfect as a keto and low-carb side, as their flavor is sure to match your main dish perfectly!
Roasted radishes are not as filling as potatoes or rice. Of course, they barely have any carbs in them and are pretty much made of water. So even though just plain roasted radishes are fairly delicious by themselves, if you want a more satisfactory side I suggest to load ’em up!
I roasted these radishes in rendered duck fat and tossed in thinly sliced onions that got caramelized for a burst of flavor. Them loaded them with mozzarella cheese and sour cream to give a bit more nutrition from fat and protein and get them even more creamy and sumptuous.
How to make roasted radishes
You don’t need to peel the radishes, just wash them well as you would any other vegetable, and remove the greens. If using the pretty red skin radishes, the white flesh will become pinkish during roasting, as the color in the peel bleeds. Talk about a colored spring side dish!
If your radishes are different sizes, it’s best to cut them in a way that will make the pieces about the same size for even cooking, i.e. cut a larger radish in half and leave a small one whole, or quarter a large one and just halve the smaller ones.
In a roasting dish (I used a silicone baking pan), toss the cut radishes and sliced onions with the melted duck fat (for best flavor!) or olive oil, salt and freshly ground white pepper.
Arrange so that the slices of onions are among the radishes, not along the edges, or standing on top of them. This is so that they will remain moist with the radish juices and get soft and caramelized, not burned.
Roast in the pre-heated oven for about 40 minutes at 220 °C (428 °F). Midway through cooking, open the oven and give the radishes a stir.
When the radishes look shriveled and soft, remove from the oven. Pierce a larger one with a fork to test doneness, it should be tender all the way through.
Spread the fresh mozzarella cheese evenly on top of the radishes and take it back into the oven until it’s fully melted.
Serve the keto loaded roasted radishes with caramelized onions immediately while hot. They go very well topped with sour cream or ranch dressing! Add some chopped parsley or spring onions for a touch of color and flavor.
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- 250 grams radishes, greens and ends removed
- 100 grams fresh mozzarella
- 50 grams onion, thinly sliced
- 25 grams duck fat (or olive oil)
- ¼ teaspoon salt
- 1 teaspoon coarse ground white pepper
- Garnish suggestions: sour cream or ranch dressing, chopped parsley or green onions
- Pre-heat oven to 220 °C (428 °F)
- Half or quarter the radishes, trying to get them all at a similar size for even cooking.
- In a roasting dish, toss the cut radishes and sliced onions with the melted duck fat (or olive oil), salt and pepper.
- Roast in the oven for about 40 minutes at 220 °C (428 °F). Midway through cooking, open the oven and stir the radishes .
- Remove from the oven when the radishes are shriveled and soft. Test with a fork, it should be tender all the way through.
- Spread the cheese on top of the radishes and take it back into the oven until it's fully melted.
- Serve immediately while hot. It goes very well topped with sour cream or ranch dressing, and some chopped parsley or spring onions for a touch of color and flavor.
US Cups approximate conversion: Use 2 bunches of radishes (about 20 radishes), ½ cup mozzarella, ½ small onion, 2 tablespoons duck fat or olive oil. Other ingredients as indicated.
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Nutrition Information:Yield: 2 Serving Size: 1
Amount Per Serving: Calories: 257Total Fat: 21.8gCarbohydrates: 5.7gNet Carbohydrates: 2.7gFiber: 3gProtein: 9.7g
Nutrition information is provided as a guideline only. Different brands of ingredients may have different nutrition facts. If tracking macros, remake the calculations using the nutrition facts from the labels of the ingredients you selected. Net carbs calculated exclude carbs from insoluble fiber and sugar alcohols.