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The Ultimate Guide to Perfect Caramelized Onions (Stovetop and Oven Method)

A close-up of a mound of deeply golden, glossy caramelized onions served on a small white dish.
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Learn the technique to transform raw onions into sweet, golden, and deeply flavorful caramelized onions using a simple stovetop method or a hands-off oven shortcut. This is the essential kitchen staple for gourmet toppings.

Ingredients

Scale
  • 3 large yellow onions, thinly sliced
  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 1/2 teaspoon salt, plus more to taste
  • 1 teaspoon granulated sugar (optional, for faster browning)
  • 2 tablespoons water or low-sodium chicken/vegetable broth (for deglazing)

Instructions

  1. Prepare the Onions: Peel and slice the onions thinly and uniformly. Uniform slicing helps them cook evenly.
  2. Start on the Stovetop: In a large, heavy-bottomed skillet or Dutch oven, combine the butter and olive oil over medium-low heat. Add the sliced onions and the initial 1/2 teaspoon of salt. Stir to coat the onions completely in the fat.
  3. Initial Cook: Cook the onions slowly, stirring every 5 to 7 minutes. For the first 15 minutes, the onions will soften and release moisture. Keep the heat low to prevent burning.
  4. Caramelization Phase: After about 20 minutes, the onions will start to turn translucent. If you are using sugar, stir it in now. Reduce the heat to low. Continue cooking, stirring every 5 minutes. The goal is slow cooking to draw out the natural sugars.
  5. Deglaze (If Needed): If brown bits stick to the bottom of the pan (fond), add 1 tablespoon of water or broth, scrape the bottom of the pan gently with a wooden spoon, and incorporate the bits back into the onions. This adds deep flavor.
  6. Achieve Color: Continue cooking until the onions reach a deep, rich golden-brown color, which can take 40 to 60 minutes total, depending on the heat and quantity. They should be jammy and tender.
  7. Oven Shortcut (Optional): If you prefer a hands-off approach, after coating the onions in fat and salt, spread them in a single layer on a baking sheet lined with parchment paper. Bake at 350°F (175°C) for 45 minutes, stirring halfway through, until golden brown.
  8. Finish: Taste and adjust salt if necessary. Your **best caramelized onions** are ready to use as a **gourmet onion topping** or in dishes like **Caramelized Onion Pasta Sauce**.

Notes

  • For a richer flavor, substitute 1 tablespoon of the butter with 1 tablespoon of balsamic vinegar during the last 10 minutes of cooking.
  • These onions freeze well. Cool them completely, place them in an airtight container, and freeze for up to 3 months.
  • If you are making **Vegan Caramelized Onions**, use only olive oil or vegan butter substitute instead of dairy butter.

Nutrition

Find it online: https://juliameal.com/caramelized-onions-ultimate-guide-recipe/