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The Ultimate Guide: How to Perfectly Caramelize Onions

Close-up of richly colored, sweet caramelized onions piled high in a small white bowl.
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Learn the basic cooking technique to transform sharp onions into sweet, golden brown onions. This method draws out natural sugars, creating a deep flavor booster perfect for burgers, sandwiches, and pasta.

Ingredients

Scale
  • 3 large yellow onions, thinly sliced
  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 1 teaspoon salt
  • 1/2 teaspoon sugar (optional, for faster caramelization)

Instructions

  1. Slice the onions thinly and uniformly. Uniform slices cook evenly.
  2. Place a large, heavy-bottomed skillet over medium-low heat. Add the butter and olive oil. Wait until the butter melts and coats the pan.
  3. Add all the sliced onions to the skillet. Stir to coat them completely 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. Continue cooking, stirring every 5 minutes. This slow process allows the natural sugars to break down and caramelize without burning. This stage takes 30 to 45 minutes.
  6. If the onions start sticking too much or look like they might burn, add 1 tablespoon of water to the pan and scrape up the browned bits (fond) from the bottom. This adds moisture and flavor back into the onions.
  7. Continue cooking until the onions reach a deep, rich golden brown color and have a jammy, tender texture. This can take 45 to 60 minutes total, depending on the heat.
  8. If using, stir in the optional sugar during the last 10 minutes of cooking to aid in browning.
  9. Remove from heat. These sweet caramelized onions are now ready to use as a gourmet onion flavor topping.

Notes

  • Patience is key; rushing this process results in burnt or merely sautéed onions, not true caramelized onions.
  • For a weeknight flavor booster, you can use a slow cooker on low for 4 to 6 hours to achieve a similar result with less hands-on time.
  • These onions store well in the refrigerator for up to one week, making them great for meal prep.

Nutrition

Find it online: https://cookingbyjade.com/caramelized-onions-ultimate-guide-and-uses/