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The Magic of Caramelized Onions

The Magic of Caramelized Onions

Caramelized > Raw

In my mind, caramelized onions will trump raw onions almost every time. Where raw onions are pungent and biting, caramelized onions are soft, sweet and rich. Though they take additional prep time, they are worth every minute. If you’re typically short on time, make a large batch of caramelized onions and refrigerate or freeze until you need them. Caramelized onions can be stored in the refrigerator for four to five days, or frozen for weeks.

Onion Science

Cooking the onions ‘low and slow’ is the key to perfect caramelized onions that are cooked and soft throughout. As water slowly evaporates during cooking, the onions soften. Eventually, the natural sugars within the onion begin to break down. As the sugars break down, chemical reactions begin to occur, causing browning and the release of volatile compounds that provide the sweet aromas associated with caramelized onions.

How to Caramelize Onions

1. Slice or chop your onions into uniform pieces. This will ensure even cooking and browning.

Tip: Yellow or sweet varieties of onions caramelize the best.

2. In a Dutch oven, warm 1 to 3 tablespoons of extra virgin olive oil (depending on how many onions you are caramelizing) over low heat.

Tip: A Dutch oven or other covered pan works best, but a skillet will work in a pinch.

Tip: In my experience, I’ve found that cast iron pans work particularly well for caramelizing onions.

3. Add the onions to the pan and stir to coat with the oil, then cover the pan. Allow to cook undisturbed for about 10 minutes.

4. Add the salt, stir the onions and cook, stirring often to ensure the onions don’t stick to the pan, for another 20-30 minutes.

Tip: Adding the salt helps pull the moisture and sugars out of the onions to help them caramelize.

Tip: You can add a pinch of sugar at this point to add in the caramelization, but this is optional.

5. When the onions are soft and brown (not yellow or golden), remove from the pan.

How to use them

Caramelized onions can be used in almost every savory dish, but here are some of my favorite uses:

  • As a pizza topping
  • On burgers
  • As part of a marinara or other pasta sauce
  • In meat or vegetable sandwiches
  • As a frittata mix-in
  • Turned into French onion soup
  • In salads
  • Mixed into mashed potatoes

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  • didama By didama
    06.15.11  

    I use caramelize onions in everything from meat dishes to quiches. Yum!

  • jessicamac By jessicamac
    06.15.11  

    I make them for my favorite leftover recipe: leftover lamb sandwich: Leftover sliced lamb, provolone cheese, caramelized onions, and mustard on toasted rye. Yum.

  • lauralee By lauralee
    06.15.11  

    I'm a big fan of them on pizza--grilled chicken, zucchini and caramelized onions are a great combo!

  • scentednights By scentednights
    06.16.11  

    Looks delicious. I'll have to try that!

  • ChefErin By ChefErin
    06.22.11  

    I often finish my caramelized onions with a little splash or masala wine. The nutty sweetness really enhances the onions! ~ Chef Erin

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