5 from 30 votes
Balsamic Onions Recipe
These balsamic onions are thin wedges of red onion slowly roasted and basted with a mix of balsamic vinegar, olive oil, and sugar until deeply caramelized. The slow roasting cooks the onions through while the basting helps develop a rich glaze and sweet, tangy flavor. These onions can complement roasted meats or sandwiches and can be made ahead to develop more depth.
Prep Time
5 mins
Cook Time
35 mins
Servings:
8
Calories:
162 kcal
Course:
Side Dish
Cuisine:
Italian, American
Ingredients
- 2 onion red, large, peeled, cut into thin wedges
- ½ cup balsamic vinegar
- ½ cup olive oil
- 3 tablespoons 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.
Cup of Yum
Notes
- Prepare balsamic onions up to 2 days ahead for convenience and flavor development.
- Store onions covered in the refrigerator for up to 5 to 6 days or freeze for up to 3 months; thaw fully before reheating.
- Reheat gently on a parchment-lined sheet tray covered with foil at 350°F for 5 to 7 minutes to maintain texture.
- You can substitute red onions with white, sweet, or yellow onions depending on availability.
- For deeper caramelization, roast the onions an extra 10 to 15 minutes beyond the initial cooking time.
Nutrition Information
Calories
162kcal
(8%)
Carbohydrates
10g
(3%)
Protein
0.4g
(1%)
Fat
14g
(22%)
Saturated Fat
2g
(10%)
Polyunsaturated Fat
1g
(6%)
Monounsaturated Fat
10g
(50%)
Sodium
5mg
(0%)
Potassium
58mg
(1%)
Fiber
0.5g
(2%)
Sugar
8g
(16%)
Vitamin A
1IU
(0%)
Vitamin C
2mg
(2%)
Calcium
11mg
(1%)
Iron
0.3mg
(2%)
Nutrition Facts
Serving: 8 Serving
Amount Per Serving
Calories 162
% Daily Value*
| Calories | 162kcal | 8% |
| Carbohydrates | 10g | 3% |
| Protein | 0.4g | 1% |
| Fat | 14g | 22% |
| Saturated Fat | 2g | 10% |
| Polyunsaturated Fat | 1g | 6% |
| Monounsaturated Fat | 10g | 50% |
| Sodium | 5mg | 0% |
| Potassium | 58mg | 1% |
| Fiber | 0.5g | 2% |
| Sugar | 8g | 16% |
| Vitamin A | 1IU | 0% |
| Vitamin C | 2mg | 2% |
| Calcium | 11mg | 1% |
| Iron | 0.3mg | 2% |
* Percent Daily Values are based on a 2,000 calorie diet.