Balsamic Onions Recipe

User Reviews

5

30 reviews
Excellent

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.

Description

Balsamic Onions Recipe features thinly sliced wedges of large red onions roasted at 375°F, basted every 5 minutes with a mixture of balsamic vinegar, olive oil, and sugar. The repeated basting causes the onions to caramelize and develop a deep sweet and tangy glaze. Roasting them on parchment-lined trays helps with even cooking and ease of handling. The mixture of vinegar and sugar balances sweetness and acidity.

The onions soften completely and take on a rich dark color from caramelized sugars and balsamic reduction. This method intensifies onion flavor with a mellow finish, making them suitable as a condiment or side dish. The presence of balsamic vinegar notably gives a sweet yet tangy flavor contrasted with the onion's natural savoriness.

They can be served warm or cooled, great for topping grilled meats, sandwiches, or salads. Because they keep well, you can prepare them ahead of time and store in the refrigerator. Proper reheating involves gentle warming to preserve the texture and flavor without overcooking.

The notes advise storing in a covered container in the fridge for 5–6 days, and they freeze well for up to 3 months, thawed in the refrigerator prior to reheating. For reheating, warming in a 350°F oven covered with foil for 5–7 minutes is recommended. Alternative onion types like white, sweet, or yellow onions can be used, and cooking for an additional 10–15 minutes yields more caramelization.

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Ingredients

Servings
  • 2 onion red, large, peeled, cut into thin wedges
  • ½ cup balsamic vinegar
  • ½ cup olive oil
  • 3 tablespoons sugar

Instructions

  1. Slice the onions into thinly sliced wedges, or you can slice the onions into rings that are about ¼” to ½” thick.
  2. 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.
  3. While they are roasting, whisk together the balsamic vinegar, olive oil, and sugar in a medium-sized bowl.
  4. Baste the onions using a brush every 5 minutes until they are a dark caramelized color.
  5. Remove the onions once they are done cooking and serve them or store them.

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

Show Details
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: 8Serving

Amount Per Serving

Calories 162 kcal

% 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.

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