"As these onion halves cook, the balsamic mixture becomes syrupy and caramelizes the onions, giving them a bronzed caramel color and a luscious, rich flavor...."
INGREDIENTS
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2 tablespoons butter, melted
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1 tablespoon olive oil
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⅓ cup balsamic vinegar
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2 tablespoons dry white wine, reduced-sodium chicken broth or water
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1 tablespoon sugar
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¼ teaspoon salt
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⅛ teaspoon ground black pepper
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4 medium yellow onions (about 1½ pounds total)
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Fresh thyme leaves (optional)