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Easy Flavorful Caramelized Onions Recipe

Flavorful Caramelized Onions are slowly cooked until golden, sweet, and deeply savory. This simple technique transforms everyday onions into an umami-rich topping that elevates sandwiches, burgers, pastas, eggs, and countless other dishes.
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Prep Time 10 minutes
Cook Time 50 minutes
Total Time 1 hour
Servings: 2 cups
Course: Side Dish
Cuisine: American
Calories: 178
Ingredients Method Notes

Ingredients
  

  • 2 large yellow onions thinly sliced
  • 2 tablespoons unsalted butter
  • 1/2 teaspoon salt
  • 1 teaspoon balsamic vinegar

Method
 

  1. Slice onions pole-to-pole into 1/4-inch strips and separate layers.
  2. Melt butter in a heavy-bottomed skillet over medium-low heat.
  3. Add onions and salt, cooking for 5 minutes until softened.
  4. Continue cooking for 40–50 minutes, stirring every 5 minutes until deep golden brown.
  5. Deglaze pan with 1 tablespoon water if onions begin to stick.
  6. Remove from heat and stir in balsamic vinegar. Adjust salt to taste.

Notes

Low and slow heat is key for true caramelization. Avoid rushing the process for the best flavor.