Sweet & Savory Roasted Balsamic Onions (Low-Carb Option)

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These Roasted Balsamic Onions are the perfect sweet and savory mix, a simply gorgeous colorful side dish that's surprisingly easy to make and melt-in-your-mouth delicious.

The onions turn out surprisingly buttery soft with a fantasic flavor that compliments any meal.

balsamic baked onions sliced in half on a white plate.

If you've never tried roasted onions, after trying this recipe you'll wonder why it took you so long.

I tried it the first time because I overbought bulk organic red onions from Azure Standard (I have a problem overbuying when there's a great sale) and needed to figure out something to do with all of those onions, but I wished I'd tried it sooner!

Why You'll Love This Recipe

This recipe just has so much going for it. It's

  • easy
  • healthy
  • customizable to be low-carb if needed.
  • pretty, especially when using red onions.
  • special enough for entertaining, yet easy enough for every day.
  • frugal. While balsamic isn't super cheap, most of the ingredients are quite affordable.
  • delicious. So good, in fact, that when I first made these, our youngest (he was very young at the time), danced around saying that this was the best dish I'd ever made!

Ingredients

Following is the basic ingredient list. For the full list with amounts, simply scroll to the printable recipe card.

  • onions (red or white)
  • balsamic vinegar
  • oil (avocado or olive)
  • paprika
  • sweetener
  • salt

Directions

This dish is easy peasy. Here are the basic directions. For the complete instructions, scroll to the printable recipe card.

  • Simply wash the onions and cut them in half, leaving the peels on and place in a bowl.
  • Combine the rest of the ingredients and pour them over the onion halves.
  • Arrange the onions in a baking dish and bake.
baked balsamic onions in baking pan

How to Serve These Baked Onions

These onions are great on their own, but there are many other ways to use them.

Should You Bake Onions With or Without Peels?

You can make these roasted onions either way, but there are a number of reasons why leaving the peel on is better.

  • Appearance: They are simply prettier baked this way.
  • Easier to eat: If you bake these without the peels, the onions can turn to mush and be kind of hard to eat. With the peel on, they have a nice little “container” that holds the onion halves for you on your plate.
  • Nutritional benefits: There is a lot of nutrition in onion peels (source). So it makes sense to cook onions (that are well washed) with peel on and not to toss the onion closest to the peel. Some of these nutrients will end up in the outer part of the onion and/or in the liquid that ends up in the pan. So make sure to scoop that up and drizzle it over the onions when they're done.
  • Less waste: By baking the onions in their peels, you will be more likely to eat all of the onion, rather than tossing the nutritious part just below the peel.
baked balsamic onions on white plate.Pin

Recipe Notes

  • Cutting the onions in half so that the stem is in the center of the cut half makes for a better presentation.
  • Oil choice: I recommend choosing an oil based on its smoke point, and avocado oil has a very high smoke point. Please choose your oil based on the oven temperature that you will be using.
  • Sweetener Options: Although xylitol works well for low carb, organic erythritol works as well. Organic maple syrup, honey, or organic coconut sugar are great AIP options.

Special Diet Options

roasted balsamic onions cut in half

Balsamic Baked Onions (Low-Carb Option)

A cross between sweet and savory, these Balsamic Baked Onions are a gorgeous colorful side dish–perfect for every day or entertaining.
Print Pin Rate
Course: Side Dish
Cuisine: AIP, Dairy-Free, Gluten-Free, Grain-Free, Keto, Low-Carb, Paleo, Vegan, whole30
Keyword: baked balsamic onions
Servings: 4 onions
Calories: 218kcal

Ingredients

  • 2 pounds red onions (small to medium)
  • 1/4 cup avocado oil
  • 1 tablespoon balsamic vinegar
  • 2 teaspoons smoked paprika (regular is OK too but smoked is nicer – see Recipe Notes for AIP)
  • 2 tablespoons allulose (or other sweetener, as desired)
  • 1/4 teaspoon salt (or to taste)

Instructions

  • Wash onions.
  • Cut onions in half and place in a bowl.
  • Mix other ingredients and pour over onions.
  • Toss to coat.
  • Place onions flat side down in a baking dish and drizzle with any remaining spice mixture.
  • Bake in 450 oven for 30-40 minutes (40 makes them softer and easier to digest). Alternatively, bake at 350 for 1 hour or more to desired doneness.
  • Serve with the skins on and the extra balsamic liquid either drizzled on top or offered on the side.

Notes

  • Cutting the onions in half so that the stem is in the center of the cut half makes for a better presentation.
  •  I recommend choosing an oil based on its smoke point, and avocado oil has a very high smoke point. Please choose your oil based on the oven temperature that you will be using.
  • Any sweetener can be substituted for the xylitol. Although xylitol works well for low carb, erythritol works as well. Maple syrup, honey, or coconut sugar are great AIP options.  
Special Diet Options

Nutrition

Serving: 1onion | Calories: 218kcal | Carbohydrates: 23g | Protein: 3g | Fat: 14g | Saturated Fat: 2g | Sodium: 156mg | Potassium: 354mg | Fiber: 4g | Sugar: 10g | Vitamin A: 493IU | Vitamin C: 17mg | Calcium: 52mg | Iron: 1mg | Net Carbs: 19g

Nutritional information is provided as a courtesy and is merely an approximation. Optional ingredients are not included and when there is an alternative, the primary ingredient is typically used. We cannot guarantee the accuracy of the nutritional information given for any recipe on this site. Erythritol carbs are not included in carb counts since they have been shown not to impact blood sugar. Net carbs are the total carbs minus fiber.

I hope you enjoy this recipe. It's great for an every day side dish and pretty enough for a special occasion as well.

What is your favorite recipe that uses red onions?

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26 Comments

    1. I have never used one. Convection yes but I think an air fryer is different. I hope to try a fryer soon – do you have one that you recommend?

    1. Oh no Carol. I know we are having trouble w/ the food recipes on my site.

      Have you printed other food recipes today? I think we have a fix for it ….. but it might not happen today. I can maybe figure out a workaround for you. Let me know.

  1. OK, yum, yum and more yum. The taste of red onions with balsamic is to die for! Thanks for sharing this fab recipe-

  2. How do you think they would be without any oil? We are fat free, oil free vegan for my husband’s heart health

    1. Hi there. I used to be fat free, thinking that fat was the culprit for heart health, but from some of the research that I have done oil isn’t the issue – inflammation from carbs is. But please do not go against your doctor’s advice. I would just encourage you to do research.

      You could do this without oils, but maybe you will have to add a little liquid. I hope you like them!

    1. Oh it’s not dumb at all. I just added more information to the post. I will be writing more about it in the future. Thanks for bringing that up and for reading :).