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Remove the lid after about 20 minutes, and increase the heat to medium-low. If desired, add a splash of balsamic vinegar or soy sauce for extra flavor. This step will help the onions turn a deep golden brown and enhance their natural sweetness.
Continue to cook the onions, stirring frequently, until they are completely caramelized and richly browned.
Serve:
Use these caramelized onions as a topping for burgers, steaks, or grilled cheese sandwiches. They also make a great addition to pizzas, pasta dishes, or even as a side to complement main courses.
Tips:
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