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The Ultimate Secret to Perfectly Sweet and Slow Caramelized Onions

A close-up of a pile of deeply browned and glossy caramelized onions served on a small white dish.
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Learn the foundational technique for slow-cooking onions until they are deeply sweet, jammy, and golden brown. This method works for any recipe application.

Ingredients

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

Instructions

  1. Prepare the onions: Peel and slice the onions thinly and uniformly. Uniformity helps them cook evenly.
  2. Start the heat: Place a large, heavy-bottomed skillet or Dutch oven over medium-low heat. Add the butter and olive oil.
  3. Add onions and salt: Once the butter melts, add all the sliced onions and the salt. Stir to coat them evenly with the fat.
  4. Initial cooking: Cook the onions uncovered for 15 minutes, stirring every 3 to 4 minutes. The onions will soften and release moisture.
  5. Reduce heat and continue: Lower the heat to low. Continue cooking, stirring every 5 to 7 minutes. This slow process develops the deep flavor.
  6. Add sugar (optional): If using, sprinkle the sugar over the onions after about 30 minutes of cooking. This aids in the caramelization process.
  7. Deglaze: If brown bits stick to the bottom of the pan, add 1 to 2 tablespoons of water or broth. Scrape the bottom of the pan with a wooden spoon to incorporate the flavor back into the onions.
  8. Finish cooking: Continue cooking, stirring occasionally, until the onions reach your desired deep brown color and jammy texture. This usually takes 45 to 60 minutes total.
  9. Use immediately or store: Remove from heat. Use as a topping or proceed to your chosen recipe, like caramelized onion dip or pasta.

Notes

  • For faster caramelization (Fast Track): Cook over medium heat, stirring every 2 minutes. You will need to deglaze more frequently to prevent burning. Total time may be reduced to 25 minutes, but the flavor depth will be slightly less intense.
  • Use sweet onions like Vidalia or Walla Walla for the best natural sweetness.
  • Store leftover caramelized onions in an airtight container in the refrigerator for up to one week.

Nutrition

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