Servings
Font
Back
5.0 from 6 votes

Roasted Red Onions Recipe

Roasted Red Onions are a great flavor booster for salads, tacos, sandwiches, and grains. This 3-ingredient vegan recipe also makes a tasty side dish.

Prep Time
5 mins
Cook Time
5 mins
Total Time
25 mins
Servings: 1 cup
Calories: 293 kcal
Course: Side Dish , Condiments
Cuisine: American

Ingredients

  • 1 large red onion
  • 2 tablespoons extra virgin olive oil
  • ½ teaspoon kosher salt
  • ¼ teaspoon black pepper optional

Instructions

    Cup of Yum
  1. Preheat the oven to 400 degrees F. Line a baking sheet with parchment paper (or foil) and set it aside.
  2. Peel the onions by removing the outer layer and inner papery skin. When cutting, you can either slice them in rings (and keep them whole) or split them into half-moon slices (and separate them.) Either way, for even baking, we recommend cutting them into ¼ inch slices.
  3. Season them depending on how you cut them:- Cut into rings: Place the red onion rings onto the prepared sheet pan on a single layer. Brush them on both sides with extra virgin olive oil and sprinkle them with salt and pepper (if using.)- Sliced thinly: Gently break apart the slices and place them in a medium-sized bowl. Drizzle with olive oil and sprinkle with salt and pepper. Toss to combine. Spread on the prepared baking sheet on a single layer.
  4. Roast, flipping (if you are cooking them as rings) or stirring (if you are baking them as thin slices) until softened and caramelized, for about 20 minutes*.
  5. Remove from the oven, and let them cool slightly before using in your recipe.

Notes

  • Yields: This recipe makes 1 to ½ cups of roasted sliced red onions.
  • Baking time: During the recipe testing, we found out that the roasting time stayed the same for both cutting methods.
  • Let them cool to room temperature, place them in an airtight container and store them in the refrigerator for 3-4 days.
  • You can enjoy this recipe either hot or cold, but if you prefer to serve them hot you can reheat them using one of the three methods below:
  • Put the leftovers in an oven-proof baking dish with a splash of water. Roast them in preheated 350 degrees F. oven until heated through for about 8-10 minutes.
  • Add the red caramelized onions to a saucepan with a little bit of oil (or water) and saute until thoroughly warmed.
  • Yields: This recipe makes 1 to ½ cups of roasted sliced red onions.
  • Baking time: During the recipe testing, we found out that the roasting time stayed the same for both cutting methods.
  • Storing: Let them cool to room temperature, place them in an airtight container and store them in the refrigerator for 3-4 days.

  • Reheating: You can enjoy this recipe either hot or cold, but if you prefer to serve them hot you can reheat them using one of the three methods below:

    Oven: Put the leftovers in an oven-proof baking dish with a splash of water. Roast them in preheated 350 degrees F. oven until heated through for about 8-10 minutes. Saute: Add the red caramelized onions to a saucepan with a little bit of oil (or water) and saute until thoroughly warmed. Microwave: Place onions in a microwave-safe container with a splash of water. Heat in 30-second increments, stirring each time, until heated through.

  • Oven: Put the leftovers in an oven-proof baking dish with a splash of water. Roast them in preheated 350 degrees F. oven until heated through for about 8-10 minutes.
  • Saute: Add the red caramelized onions to a saucepan with a little bit of oil (or water) and saute until thoroughly warmed.
  • Microwave: Place onions in a microwave-safe container with a splash of water. Heat in 30-second increments, stirring each time, until heated through.
  • Not a fan of red onions? You can use this method/recipe to roast yellow onions as well.

Nutrition Information

Calories 293kcal (15%) Carbohydrates 11g (4%) Protein 1g (2%) Fat 28g (43%) Saturated Fat 4g (20%) Polyunsaturated Fat 3g Monounsaturated Fat 20g Sodium 1168mg (49%) Potassium 168mg (5%) Fiber 2g (8%) Sugar 5g (10%) Vitamin A 5IU (0%) Vitamin C 8mg (9%) Calcium 29mg (3%) Iron 0.5mg (3%)

Nutrition Facts

Serving: 1cup

Amount Per Serving

Calories 293

% Daily Value*

Calories 293kcal 15%
Carbohydrates 11g 4%
Protein 1g 2%
Fat 28g 43%
Saturated Fat 4g 20%
Polyunsaturated Fat 3g 18%
Monounsaturated Fat 20g 100%
Sodium 1168mg 49%
Potassium 168mg 4%
Fiber 2g 8%
Sugar 5g 10%
Vitamin A 5IU 0%
Vitamin C 8mg 9%
Calcium 29mg 3%
Iron 0.5mg 3%

* Percent Daily Values are based on a 2,000 calorie diet.