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How to make caramelized onions

The options and versatility of caramelized onions are endless!   Use them in a quiche or a tart, in a French onion soup.  The subtly sweet flavor of the caramelized onions combined with the savory is so addicting!  This recipe has detailed instructions on how to caramelize onions perfectly. 
Course Side Dish
Cuisine American
Keyword caramelized onions, how to caramelize onions
Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Servings 4 servings
Calories 98kcal
Author Julia


  • 2 tablespoons olive oil
  • 3 onions medium or large, sliced
  • pinch of salt
  • 1 tablespoon balsamic vinegar


  • Heat 2 tablespoons olive oil on high heat in a large skillet, when oil is heated, add sliced onions and cook on high heat for about 10 minutes, constantly stirring with the spatula. The onions should start to brown, but without burning (a couple of onions may be burnt here and there, but overall they should not be charred).
  • Reduce heat to medium and continue cooking onions for 10 more minutes, continuing to stir, as onions brown even more without burning. At this point add just a pinch of salt over onions.
  • Continue cooking the onions for 10 more minutes on medium or low heat, stirring occasionally to make sure onions don’t stick to the bottom of the pan or burn. Add a little bit of water if they start to stick. Total, by now you should have cooked onions for 30 minutes.
  • Remove from heat and sprinkle onions with a small amount of balsamic vinegar to deglaze the pan. Using spatula, mix the onions, scraping the bottom of the pan and coating onions with a pinch of balsamic vinegar you just added.


Calories: 98kcal | Carbohydrates: 8g | Fat: 7g | Saturated Fat: 1g | Sodium: 4mg | Potassium: 120mg | Fiber: 1g | Sugar: 4g | Vitamin C: 6.1mg | Calcium: 19mg | Iron: 0.2mg