Description
These Caramelized Onions are slow-cooked to golden perfection with butter and a splash of balsamic vinegar, creating a rich, sweet, and savory topping perfect for burgers, sandwiches, and more.
Ingredients
Scale
- 2 tablespoons unsalted butter
- 1 extremely large onion, peeled and thinly sliced (about 5 cups sliced)
- 1/4 cup water, as needed
- 1/2 teaspoon salt
- 2 tablespoons balsamic vinegar
Instructions
- Melt butter in a large skillet over medium heat.
- Add the sliced onion and sprinkle with salt. Stir to coat the onions evenly in butter.
- Reduce heat to medium-low and cook, stirring every 5 minutes, until onions soften and begin to brown.
- If onions start sticking or browning too quickly, add a splash of water and stir.
- Continue cooking for 35–45 minutes until onions are golden, soft, and jammy.
- Stir in balsamic vinegar and cook for another 2 minutes to deglaze and deepen the flavor.
- Serve immediately or let cool before storing.
Notes
- Use a wide pan to allow even cooking and proper caramelization.
- Be patient—low and slow heat brings out the natural sweetness.
- Store leftovers in the fridge for up to 5 days or freeze for up to 3 months.
Nutrition
- Serving Size: 1/4 cup
- Calories: 85
- Sugar: 5g
- Sodium: 290mg
- Fat: 5g
- Saturated Fat: 3g
- Unsaturated Fat: 2g
- Trans Fat: 0g
- Carbohydrates: 9g
- Fiber: 1g
- Protein: 1g
- Cholesterol: 10mg