Caramelized Onions Recipe
This classic caramelized onion recipe is slow-cooked until dark brown, tender, and loaded with delicious sweet and savory flavors.
Ingredients
- 2 large yellow onions
- 1 large red onion
- 2 tablespoons unsalted butter
- 2 teaspoons apple cider vinegar
- coarse salt to taste
Instructions
- Slice the onions about 1/8” to ¼” thick.
- Add the butter to a large thick-bottomed stainless-steel pan or pot, or a large cast iron skillet and heat over medium heat.
- Once the butter is melted, add onions, gently season with salt, maybe ¼ teaspoon, and mix to combine.
- Cover and let the onions stand untouched for 5 to 6 minutes. During this process, the onions will release moisture from the salt, helping steam them while covered, making the process go faster.
- Remove the lid, and you’ll notice the onion liquid will be evaporated. Stir the onions for 1 to 2 minutes. They should start to turn light brown.
- Turn the heat to low-to-low medium and stir every 6 to 8 minutes for the next 30 to 35 minutes or until very dark brown.
- Deglaze with the vinegar, season with salt, and stir to combine.
- Serve the caramelized onions. Try adding them to my patty melt recipe.
Notes
Make-Ahead: You can make these caramelized onions 2 days ahead.
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 large frying pan with 1tablespoon of oil or butter over low to medium heat and sauté for 3 to 4 minutes or until warm.
You can also use a non-stick skillet or enameled pan.
If you start to see the onions sticking too much to the bottom of the pan and overly browning on the verge of burning, deglaze with a few tablespoons of water. This will temporarily help slow down that process. Then, be sure to adjust the heat lower.
The darker the onions, without burning them. of course, the sweeter and more savory they become.
Nutrition
Calories: 335kcalCarbohydrates: 31gProtein: 4gFat: 23gSaturated Fat: 15gPolyunsaturated Fat: 1gMonounsaturated Fat: 6gTrans Fat: 1gCholesterol: 60mgSodium: 17mgPotassium: 496mgFiber: 6gSugar: 14gVitamin A: 706IUVitamin C: 24mgCalcium: 83mgIron: 1mg