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The Ultimate Guide to Perfect Caramelized Onions: From Sharp to Sweet

A close-up shot of a mound of deeply browned, sweet caramelized onions resting on a white plate.
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Learn the best way to cook onions sweet by mastering the slow cooking technique for deep flavor. These caramelized onions are a kitchen staple perfect for dips, pasta, or as a gourmet onion topping.

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 vegetable broth (for deglazing)

Instructions

  1. Slice the onions thinly and uniformly. Uniformity helps them cook evenly.
  2. Combine the butter and olive oil in a large, heavy-bottomed skillet or Dutch oven over medium-low heat.
  3. Add the sliced onions and salt to the pan. Stir well to coat them in the fat.
  4. Cook the onions slowly, stirring every 5 to 10 minutes. Keep the heat low to prevent burning. This slow cooking process draws out the natural sugars.
  5. After about 20 minutes, the onions will be soft and translucent. If the bottom of the pan starts to brown too quickly, add a tablespoon of water or broth to scrape up the browned bits (this is called deglazing).
  6. Continue cooking, stirring more frequently as they start to brown, usually another 15 to 25 minutes. If you are using sugar, add it now.
  7. The onions are perfectly caramelized when they are deep golden brown, jammy, and significantly reduced in volume. This usually takes 35 to 45 minutes total for the best flavor.
  8. Remove from heat. Use immediately as a savory sweet onion topping or store for later use.

Notes

  • For a quick onion hack, add 1 teaspoon of sugar after the onions have softened (about 15 minutes in) to speed up the caramelization process slightly.
  • If you want a vegan caramelized onion recipe, use only olive oil instead of butter.
  • These slow cooked onions are the base for fantastic French onion pasta sauce or creamy onion pasta ingredient.
  • For an easy onion recipe, use a 3-ingredient method: just onions, oil, and salt, but expect the cooking time to be closer to 50 minutes.

Nutrition

Find it online: https://cookifyme.com/caramelized-onions-ultimate-guide-sweet-jammy-easy/