Don't let the name fool you. The flavor of this sauce is subtle--not oniony at all.
3 tablespoons butter
1/3 cup finely chopped sweet onion
1/4 cup all-purpose flour
1 (14-ounce) can beef broth
2 teaspoons soy sauce
1/4 teaspoon freshly ground pepper
Garnish: chopped fresh chives
How to Make It
Melt butter in a medium saucepan over medium heat; add onion, and sauté 5 to 7 minutes or until lightly browned. Whisk in flour. Cook, whisking constantly, until lightly browned (about 1 minute). Gradually whisk in broth and next 2 ingredients. Cook, whisking constantly, until thickened and bubbly. Garnish, if desired.