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How to Make Caramelized Onions – Super Delicious Recipe

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Caramelized onions add a unique flavor to almost any dish you make. You can now enjoy this popular restaurant treat in your very own home. Today, I want to show you how to make caramelized onions, which might be even better than the restaurants!

What I Love About This Caramelized Onions Recipe

While this caramelized onions recipe does take a little bit of time to cook, the results are so worth it. There’s nothing like reproducing restaurant menu items in your own kitchen!

It’s super easy to make, and you can add these onions to literally anything. The sky is the limit.

What to Serve With Caramelized Onions

Oh, where do I start? You can serve these caramelized onions obviously on burgers, but here are a few other suggestions you might want to try:

  • sandwiches
  • stirfries
  • sauteed mushrooms
  • steaks
  • fish
  • need I go on?

Here are a couple of recipes using caramelized onions you might want to try:

What You Need to Make Caramelized Onions

Here are all the ingredients you need to make these delicious onions.

  • 3 large yellow onions
  • 3 T. unsalted butter
  • 2 T extra virgin olive oil
  • Sea salt and black pepper to taste
  • 1/3 c. balsamic vinegar

Before you go whipping up this tasty burger topper, you should ask yourself: Can you eat onions on keto?

You’ll be surprised to learn the answer. That being said, I love caramelized onions on my burgers and steaks and even on roast chicken and seafood from time to time. Try it with mushrooms for a complete meal!

How to Make Caramelized Onions

It’s really quite simple to make your own caramelized onions, though the cooking time is slightly long. But trust me when I tell you, it’s worth it!

  1. Remove both ends of the onion and cut in half lengthwise. Turn one piece of onion onto the flat side and cut into thin slices, working from one end to another. Repeat until all onions are sliced.
  2. Melt butter in a large skillet over medium heat. Add onion slices to skillet and drizzle olive oil over the top. Season with salt and black pepper to taste, and stir to combine.  
  3. Slowly cook the onions over medium heat for 45 minutes to an hour. (Total cooking time will depend on how many onions were used, the sugar content in the onions, and how old they are). Stir the onions every 5 or 10 minutes while they are cooking to prevent scorching.
  4. Once the onions are done caramelizing, add balsamic vinegar to deglaze the pan. While the liquid is bubbling, gently scrape the bottom of the pan with a wooden spoon to incorporate the fond (the brown bits on the bottom of the pan) into the onions.
  5. Season with additional salt and black pepper, if desired. Use immediately, or cool and store in the refrigerator for up to one week. Enjoy!
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Frequently Asked Questions

Do you caramelize onions with butter or oil?

You can use either or, or even both combined to caramelize onions. The butter will give them a richer and creamier taste and texture.

Should you add sugar when caramelizing onions?

You can add sugar if you want a sweet and salty taste, but I use balsamic vinegar in this recipe, which gives it those two unique flavors.

What kind of onions is best for making caramelized onions?

You can use white, yellow, or even red onions to make caramelized onions. The flavor will differ slightly but they will still be delicious.

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Caramelized OnionsPin

Caramelized Onions

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Course: Appetizer, Keto Recipes
Cuisine: American
Prep Time: 15 minutes
Cook Time: 1 hour
Total Time: 1 hour 15 minutes
Servings: 6
Calories: 84kcal
Author: Iva Ursano

Ingredients

  • 3 large yellow onions
  • 3 T. unsalted butter
  • Sea salt and black pepper to taste
  • 1/3 c. balsamic vinegar

Instructions

  • Remove both ends of onion and cut in half lengthwise. Turn one piece of onion onto the flat side cut into thin slices, working from one end to another. Repeat until all onions are sliced.
    3 large yellow onions
  • Melt butter in a large skillet over medium heat. Add onion slices to skillet and drizzle olive oil over the top. Season with salt and black pepper, to taste, and stir to combine.  
    3 T. unsalted butter, Sea salt and black pepper
  • Slowly cook the onions down over medium heat for 45 minutes to an hour. (Total cooking time will depend on how many onions were used, the sugar content in the onions, and how old they are). Stir the onions every 5 or 10 minutes while they are cooking to prevent scorching.
  • Once the onions are done caramelizing, add balsamic vinegar to deglaze the pan. While the liquid is bubbling, gently scrape the bottom of the pan with a wooden spoon to incorporate the fond (the brownbits on the bottom of the pan) into the onions.
    1/3 c. balsamic vinegar
  • Season with additional salt and black pepper, if desired. Use immediately, or cool and store in the refrigerator for up to one week. Enjoy!
    Sea salt and black pepper

Nutrition

Calories: 84kcal | Carbohydrates: 7g | Protein: 1g | Fat: 6g | Saturated Fat: 4g | Polyunsaturated Fat: 0.2g | Monounsaturated Fat: 1g | Trans Fat: 0.2g | Cholesterol: 15mg | Sodium: 6mg | Potassium: 97mg | Fiber: 1g | Sugar: 4g | Vitamin A: 179IU | Vitamin C: 4mg | Calcium: 18mg | Iron: 0.2mg
On and Off Keto | + posts

Iva discovered the keto diet back in 2020 and has experimented with it, off and on. She recently took over this site and shares experiences, her knowledge and some yummy recipes. She also runs a women only website Women Blazing Trails.

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