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The Ultimate Guide: How to Perfectly Caramelize Onions (Plus 5 Ways to Use Them)

A mound of golden brown, crispy caramelized onions piled high on a white plate.
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Learn the slow cooking technique to transform raw onions into sweet, golden brown caramelized onions. This guide provides the best onion topping method and shows you how to use them in pasta and dips.

Ingredients

Scale
  • 4 large yellow onions, thinly sliced
  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 1 teaspoon salt
  • 1 teaspoon sugar (optional, for faster browning)
  • 1/4 cup water or low-sodium broth (for deglazing)

Instructions

  1. Slice the onions thinly and uniformly. Uniformity helps them cook evenly.
  2. Place a large, heavy-bottomed skillet over medium-low heat. Add the butter and olive oil.
  3. Add all the sliced onions to the skillet. Stir to coat them evenly with the fat. Add the salt.
  4. Cook the onions slowly, stirring every 5 to 7 minutes. For the first 15 minutes, the onions will soften and release moisture.
  5. Reduce the heat to low after 15 minutes. Continue cooking, stirring every 5 minutes. This slow process draws out the natural sugars.
  6. After about 30 to 40 minutes, the onions will start to turn pale gold. If the bottom of the pan develops brown bits (fond), add 1 tablespoon of water or broth and scrape the bottom of the pan to lift the flavor. This is deglazing.
  7. Continue cooking for another 20 to 30 minutes until the onions reach a deep, rich brown color and are very tender. Total cooking time is usually 60 to 75 minutes for deep flavor.
  8. If using, stir in the optional sugar during the last 10 minutes of cooking to aid caramelization.
  9. Remove from heat. These caramelized onions are now ready to use as a gourmet onion topping or ingredient.

Notes

  • For the deepest flavor, do not rush this process; low and slow cooking is key to developing sweetness.
  • If you need a faster method, use a higher heat initially, but watch carefully to prevent burning. Add a splash of balsamic vinegar near the end for a tangier flavor.
  • You can easily double or triple this recipe. Caramelized onions freeze well for later use in dishes like caramelized onion dip.
  • These are perfect as a burger topping or an addition to savory jams.

Nutrition

Find it online: https://cookingbyfelix.com/caramelized-onions-ultimate-guide-and-recipes/