Caramelized onions are onions that have been slowly cooked over low heat until they become soft, sweet, and golden brown. This process typically takes about 30 to 45 minutes, allowing the natural sugars in the onions to caramelize. The result is a rich, sweet flavor that enhances many dishes. These onions can be used in a variety of recipes, such as French onion soup, on top of burgers, or mixed into pasta dishes. Their versatility makes them a popular ingredient in both home cooking and professional kitchens, adding depth and complexity to meals.