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The Ultimate Guide to Perfectly Caramelized Onions: Techniques for Sweet, Jammy Perfection

A mound of deeply browned, glossy caramelized onions piled on a square white plate, catching the sunlight.
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Learn the proper techniques to slowly cook onions until they are deeply sweet, jammy, and brown. This guide covers the best onions, pans, and methods for achieving perfect caramelization.

Ingredients

Scale
  • 3 large yellow onions
  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 1 teaspoon salt
  • 1/2 teaspoon sugar (optional, for faster browning)
  • 2 tablespoons water or broth (for deglazing)

Instructions

  1. Prepare the onions: Peel the onions and slice them thinly and uniformly, about 1/8 inch thick. Uniformity helps them cook evenly.
  2. Heat the fat: Place a large, heavy-bottomed skillet or Dutch oven over medium-low heat. Add the butter and olive oil. Allow the butter to melt completely.
  3. Start cooking: Add all the sliced onions and the salt to the pan. Stir well to coat all the onions in the fat.
  4. Initial softening (10-15 minutes): Cook the onions, stirring every few minutes. They will release moisture and soften significantly. Do not let them brown yet. Reduce heat to low if they start browning too quickly.
  5. The slow cook (30-60 minutes): Continue cooking on low heat. Stir every 5 to 10 minutes. This slow process draws out the natural sugars. If brown bits stick to the bottom (fond), add 1 tablespoon of water or broth and scrape the bottom of the pan while stirring.
  6. Achieving color (60+ minutes): Once the onions are deeply reduced and soft, increase the heat slightly to medium-low. Stir more frequently (every 2-3 minutes) to encourage even browning. If using, sprinkle the sugar over the onions during the last 15 minutes.
  7. Finish: Cook until the onions are a deep, rich mahogany brown color and have a jammy consistency. This can take anywhere from 45 minutes (quick method) to 1.5 hours (ultimate flavor).
  8. Use or store: Remove from heat. Use immediately as a topping or store cooled onions in an airtight container in the refrigerator for up to one week.

Notes

  • Use yellow onions for the best balance of sugar and sharpness. Sweet onions like Vidalia work well but may cook faster.
  • A stainless steel or cast iron pan works best as it retains heat well and allows for good fond development. Avoid non-stick if you plan to scrape the bottom aggressively.
  • The difference between sautéed and caramelized onions is time; sautéing takes 10-15 minutes, while caramelizing requires 45 minutes or more to fully develop the sugars.
  • For a quick version, use 1 tablespoon of sugar and cook over medium heat, stirring every minute, but expect a lighter color and less depth of flavor.

Nutrition

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