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Garlic & Zest

Gourmet Cooking at Home!

How To Caramelize Onions

How To Caramelize Onions
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Do you ever find yourself craving the sweet, savory unctuousness of caramelized onions?  I do.  Part of it is their versatility — I use them in everything from breakfast frittatas to casseroles or as the crowning glory on a dish of haricots vert.  But if I’m honest, it’s the flavor — that slightly honeyed jamminess in every spoonful that makes me want more and if you’ve never made them before, here’s a simple guide on How To Caramelize Onions.

 

Yellow onions.

First, you’ll need some onions (I used 5-pounds for this batch).  Standard yellow onions are best.  Save your vidalias, white onions and red for your burgers or pico de gallo.

 

Sliced yellow onions.

Slice the onions into quarter-inch rounds.

 

Onions in the slow cooker.

Heat a large heavy bottomed pot with a lid (I prefer a dutch oven) over medium heat with a little olive oil and add the onions.  Toss the onions in the oil to coat and cook for about five minutes.  You don’t want to brown the onions, so adjust your heat if it seems too hot.  Sprinkle with a little salt, cover tightly and slowly sweat the onions.

 

Cooking the yellow onions.

Witness the metamorphosis.  It’s nothing short of amazing.   This process isn’t difficult or labor intensive – you just have to be on hand for stirring the veg and monitoring the pot for hot spots — adjusting the heat when necessary.  

 

Slow cooking onions.

Now, I’ve seen recipes for this with a “set it and forget it” mantra. “Slow-cooker” caramelized onions and “cooked in the oven” options, but I have doubts about the level of real caramelizing that goes on.  I mean, sure — they’ll soften and reduce down.  They’ll even give up their liquid.  

 

caramelized onions on a wooden spoon.

But, in my humble opinion, to achieve the Maillard reaction that transforms these eye-stinging rings into the golden hued, barely held together, strands of mild sweetness that I’m looking for, requires two things.  A sturdy dutch oven and patience.  

 

Closeup of Caramelized Onions

You’re efforts will be rewarded with this satisfying, ready-for-anything condiment.

 

Finished caramelized onions.

They are great on top of a juicy burger or tossed with blanched green beans as a special side dish.   Caramelized onions are delicious with a roast chicken and they’re mandatory for salisbury steak!

 

Closeup of caramelized onions.

To save yourself some time at the last minute, make a large batch of onions and then freeze them in 1/4 or 1/2 cup containers, that way, you’ve always got them on hand when the mood strikes.

How To Caramelize Onions
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5 from 4 votes

How To Caramelize Onions

Always keep caramelized onions on hand by making them in large batches and freezing in 1/4 cup or 1/2 cup containers.
Course Side Dish
Cuisine American
Prep Time 10 minutes
Cook Time 2 hours
Total Time 2 hours 10 minutes
Servings 8
Calories 46kcal

Ingredients

  • 1 5-pound bag yellow onions
  • 3 tablespoons olive oil
  • 1/2 teaspoon kosher salt
  • special equipment: large dutch oven with a tight fitting lid

Instructions

  • Peel and thinly slice the onions. (save the roots and peels for making vegetable stock).
  • Heat the dutch oven over medium heat and add the olive oil. Add the onions and cook gently, stirring for about 5 minutes to separate the rings of the onion and get them coated in the oil.
  • Sprinkle on the salt and stir to combine. The salt will draw out the moisture in the onions. Cover with lid and reduce heat to medium low to continue cooking.
  • Stir the pot every 15-20 minutes to assure that nothing is sticking to the bottom. If you see the onions browning -- the pan is too hot and you should reduce the heat. You want the onions to slump over the course of cooking. When they've given up all of their liquid, only then do they start to caramelize. Don't confuse "brown" with "caramel".
  • Continue cooking until the liquid has evaporated and the onions take on a deep golden hue. The onions should be so tender that they almost fall apart and should be sweet.
  • The cooking time will vary on the pot your using and the stove. Just keep checking on it regularly, stirring when necessary and not letting it stick to the bottom of the pot.
  • 5 pounds of onions reduces to about 2 cups of caramelized onions. If you're not using it all at once, portion out and freeze the remainder in small containers until ready to use.

Nutrition

Calories: 46kcal | Fat: 5g | Sodium: 145mg

Delicious Ways To Use Caramelized Onions:

Salmon and Caramelized Onion Frittata
Salmon and Caramelized Onion Frittata
Homemade French Onion Soup | Garlic & Zest
Homemade French Onion Soup

Pin It For Later!

This easy recipe gives step by step instructions on How To Caramelize Onions and different ways to use them! They're sweet and delicious - naturally vegan and gluten free!

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Side Dishes// Vegan/Vegetarian14 Comments

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Comments

  1. Tony says

    March 11, 2020 at 4:38 PM

    I’m making these for french dip sandwiches. Is there a point in the recipe where you remove the lid, or do you leave it on the whole time?

    Reply
    • Lisa says

      March 12, 2020 at 7:07 AM

      You’ll remove the lid to stir the onions, but it should be kept on for most of the time.

      Reply
  2. Rita Chapman says

    June 13, 2019 at 3:16 PM

    I would like to use these onions with garlic to add to steamed cabbage and carrots. I am making this recipe for 100 people.

    Reply
    • Lisa says

      June 13, 2019 at 5:54 PM

      That’s a lot of people! You should be able to use garlic… but I would add it after the onions start to soften. You’ll need boatloads of onions for that many folks!

      Reply
  3. Agness of Run Agness Run says

    September 21, 2017 at 3:52 PM

    I’ve tried to caramelize onions once before but it was a disaster. Thanks to your recipe, this task seems so manageable! Does this goes only for yellow onions or I can use also white ones?

    Reply
    • Lisa says

      September 22, 2017 at 7:37 AM

      I’ve never done it with white onions, but I don’t see why it wouldn’t work with them as well. You could probably use red onions as well.

      Reply
  4. Jagruti says

    September 18, 2017 at 10:59 AM

    My hubby would gobble it up straight away

    Reply
  5. Ginny McMeans says

    September 18, 2017 at 10:52 AM

    I can eat this whole pot with a spoon!

    Reply
  6. Tina Dawson | Love is in my Tummy says

    September 18, 2017 at 10:43 AM

    Wow! I had no idea! I would probably put a spoon in this and eat it straight up!

    Reply
  7. Jeni @ Biscuits & Booze says

    September 18, 2017 at 10:34 AM

    Learning how to properly caramelize onions was a game changer for me in the kitchen. I love to do it on fall days. And you’re right – low and slow is best! I’ve honestly never frozen them before. Do they retain their yumminess?

    Reply
    • Lisa says

      September 18, 2017 at 11:13 AM

      They absolutely do! I’ve found little quarter cup plastic containers that I use for freezing. It’s just the right amount of onions for a few omelettes or burgers or whatever…

      Reply
  8. Dahn says

    September 18, 2017 at 10:16 AM

    I do love the rich flavors that are pulled from caramelized onions. They can make a simple dish absolutely fabulous. I have never made them in advance and frozen them, hadn’t even thought about it… great idea.

    Reply
    • Lisa says

      September 18, 2017 at 11:12 AM

      I try to save time whenever I can!

      Reply
  9. Jill says

    March 23, 2015 at 1:57 PM

    This looks mouthwatering! I have the Dutch oven and can get the onions, just need the patience. I can’t wait to make these. Maybe tonight! What a great idea to make them ahead of time and freeze.

    Reply

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Lisa

Calling all cooks! You don’t have to be a gourmet chef to get a delicious, healthy meal on the table! At Garlic & Zest, I’ll show you how to make hundreds of seasonal, fresh recipes and indulgent comfort foods with easy step-by-step instructions and photos to help you master the dish.

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