Preheat oven to 425°F. Cut the onions in half lengthwise, leaving the skins on. In a 14-inch skillet, heat olive oil until smoking. Place 4 onion halves cut-side down into skillet and cook until dark golden brown, 7 to 8 minutes. Add vinegar and place in oven and bake until soft, 15 to 20 minutes.
Remove from oven and remove onions from pan, immediately placing cut-side up on cool plate. Pour syrup that has formed in pan over onions and let cool to room temperature.
Instructions
Preheat oven to 425°F. Cut the onions in half lengthwise, leaving the skins on. In a 14-inch skillet, heat olive oil until smoking. Place 4 onion halves cut-side down into skillet and cook until dark golden brown, 7 to 8 minutes. Add vinegar and place in oven and bake until soft, 15 to 20 minutes.
Remove from oven and remove onions from pan, immediately placing cut-side up on cool plate. Pour syrup that has formed in pan over onions and let cool to room temperature.
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