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© Meredith Corporation. All rights reserved. Used with permission.
In a large skillet, heat oil over medium-low heat. Add onions; cover and cook for 13 to 15 minutes or until onions are tender, stirring occasionally. Uncover; cook over medium-high heat for 3 to 5 minutes more or until golden, stirring occasionally. Remove pan from heat. Carefully add wine (or broth) and balsamic vinegar. Return to heat. Cook over medium heat about 2 minutes or until the liquid has evaporated, stirring occasionally. Stir in salt and pepper.