Caramelized Roasted Onions Recipe

Ingredients:
4 large onions (yellow or sweet onions work best)
3 tablespoons olive oil (or melted butter for a richer taste)
1 tablespoon balsamic vinegar (optional, for extra sweetness and depth)
1 teaspoon fresh thyme leaves (or rosemary, as an alternative)
Salt and pepper to taste
1-2 tablespoons honey or maple syrup (optional, for added caramelization)
Instructions:
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