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1. Add vegetable oil to heavy skillet. Heat over high heat.
2. Carefully add onion to smoking hot pan.
3. Stir onions until deep brown color.
4. Stir in balsamic vinegar, continue stirring until liquid reduces and evaporates.
5. Sprinkle sugar over onion and cool 1 minute longer.
6. Remove skillet, stir in salt, pepper, and rosemary.
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