Balsamic Onions Recipe
Published July 19, 2023. This post may contain affiliate links. Please read my disclosure policy.
These delicious slow-roasted balsamic onions are caramelized to perfection and burst with flavor for the perfect accompaniment to any dish. I absolutely love eating these all by themselves and stacking them high on sandwiches.
I have finally got my family to enjoy eating onions when I use them as an ingredient in one of my recipes. It’s a breakthrough. If you love onions and want new ways to cook with them, try my Spaghetti Sauce or my Philly Cheesesteak.
Balsamic Onions
Balsamic onions are onions that are roasted in the oven while being basted with balsamic vinegar that is mixed with olive oil and sugar. As you baste the onions as they roast, they become more concentrated in balsamic flavor and caramelization. The flavors in the onions are superb and will take any dish to the next level when being used.
These onions are fantastic eaten by themselves, served as an accompaniment to a dish, or served on a sandwich as is or with other ingredients, like in my Chicken Melt recipe.
Ingredients and Substitutions
- Onions – I believe red onions are the best for this recipe.
- Balsamic – Any balsamic vinegar will work for this. I prefer an aged organic balsamic that is bottled at the source.
- Oil – I like to use extra virgin olive oil, but any neutral-flavored oil will work. I prefer to use olive oil that is organic, cold-pressed, and bottled at the source with no blending.
- Sugar – Regular granulated sugar is all you will need. This will help balance out the tartness of the vinegar.
- Seasonings – Coarse salt and fresh cracked pepper will season these balsamic onions to perfection.
How to Make Roasted Balsamic Onions
Slice the onions into thinly sliced wedges, or you can slice the onions into rings that are about ¼” to ½” thick.
Evenly spread out the onions on a sheet tray lined with parchment paper and place them on the middle rack in the oven at 375° for 30 minutes.
While they are roasting, whisk together the balsamic vinegar, olive oil, and sugar in a medium-sized bowl.
Baste the onions using a brush every 5 minutes until they are a dark caramelized color.
Remove the onions once they are done cooking and serve them or store them.
Make-Ahead and Storage
Make-Ahead: You can make these balsamic onions 2 days ahead of time.
How to Store: Cover and keep them in the refrigerator for 5 to 6 days. You can freeze these covered for up to 3 months. Thaw them in the refrigerator for 1 day or until thawed.
How to Reheat: Add the onions to a sheet tray lined with parchment paper and cover it with foil. Bake in the oven at 350° for 5 to 7 minutes or until warm.
Chef Notes + Tips
- You can also use white, sweet, or yellow onions if all are available.
- For even more caramelized onion flavors, feel free to cook these for another 10 to 15 minutes.
More Recipes with Onions
Balsamic Onions Recipe
Ingredients
- 2 large peeled red onions cut into thin wedges
- ½ cup balsamic vinegar
- ½ cup olive oil
- 3 tablespoons of sugar
Instructions
- Slice the onions into thinly sliced wedges, or you can slice the onions into rings that are about ¼” to ½” thick.
- Evenly spread out the onions on a sheet tray lined with parchment paper and place them on the middle rack in the oven at 375° for 30 minutes.
- While they are roasting, whisk together the balsamic vinegar, olive oil, and sugar in a medium-sized bowl.
- Baste the onions using a brush every 5 minutes until they are a dark caramelized color.
- Remove the onions once they are done cooking and serve them or store them.
Hi. I have a jar of your balsamic dressing, may I use that instead? I’d love to make these. Thanks
no, it’s not the same.
GREAT IDEA
For someone who doesn’t care for red onions, these are delicious and the perfect compliment to any sandwich. Thanks for sharing.
By far the easiest way to have sweet, caramelized onions!! I made them to have on Christmas Eve as an appetizer with smoked salmon and a dill cream cheese spread on a baguette! YUM!!!
Great idea, thanks for this delicious recipe
my pleasure!
A simple recipe that takes a sandwich to a whole new level .
Easy, quick and oh so flavourful !
yes!
Too good!
yes indeed!
No, not yet but in recipes like this if you could say what they would pair great with I would appreciate that.
Thanks
love the recipes I’ve tried already
There are links in the post on what I Serve it on.
These are fast and easy to make. Yummy 😋
so good!!
I find myself using balsamic more and more on different things all the time. tThis one here was new to me and it is a winner! Thanks Chef!
my pleasure!
Excellent with steak!
thank you so kindly!!
Oh my goodness, these onions look so delicious. I have never heard of making them this way but they sure look good. I love onions any way there made even raw. Onions have such a great flavor on their own and can really make any food taste so much more delicious. I can’t way to try these out.