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How to Caramelize Onions Recipe

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4.3 from 61 reviews

This recipe guides you through the simple and rewarding process of caramelizing onions, transforming raw onions into sweet, deeply flavored, golden-brown layers perfect for enhancing any dish from burgers and sandwiches to soups and stews.

Ingredients

Ingredients

  • Several onions (white, yellow, or red), thinly sliced - about 3 large onions
  • 2 tablespoons butter
  • 1 tablespoon olive oil
  • 1/2 teaspoon fine sea salt
  • 1 teaspoon red wine vinegar or balsamic vinegar (optional)

Instructions

  1. Prepare the onions: Peel and thinly slice the onions evenly to ensure uniform caramelization during cooking.
  2. Heat the fat: In a large skillet or sauté pan, melt the butter with the olive oil over medium heat. Combining both helps prevent the butter from burning and adds richness.
  3. Add onions and salt: Add the sliced onions to the pan and sprinkle with the fine sea salt to draw out moisture and help with softening.
  4. Cook slowly: Reduce heat to medium-low or low and cook the onions, stirring occasionally, for about 40 to 50 minutes. Be patient and allow the natural sugars to slowly caramelize, turning the onions golden brown.
  5. Deglaze the pan: During the process, if the pan gets too dry or the onions start to stick, add a splash of water or the optional red wine vinegar or balsamic vinegar to loosen any flavorful browned bits and enhance depth of flavor.
  6. Finish: Once onions are deep golden brown and sweetly fragrant, remove from heat. Adjust seasoning if necessary and use immediately or store for later use.

Notes

  • Caramelizing onions is a slow process requiring patience, but the rich flavor payoff is worth the effort.
  • You can use any type of onion; yellow onions caramelize the sweetest.
  • Don't rush by turning up the heat; low and slow cooking is key to avoid burning and bitterness.
  • ONIONS can be refrigerated and used within 3-4 days or frozen for longer storage.
  • The addition of vinegar is optional but adds a pleasant tang and helps to balance the sweetness.