1. Heat butter in 12-inch skillet over medium heat. Add onions; cook, covered, 5 to 7 minutes, or until soft. Remove cover; cook 6 to 8 minutes or until onions are golden brown, stirring occasionally. Add wine; simmer 2 to 4 minutes or until wine is almost evaporated. Add broth, salt and pepper, cook 22 to 24 minutes or until sauce is reduced to 1-1/2 cups. Serve warm.
Test Kitchen Tips For a great pairing, use the wine you will be serving with dinner in this sauce.