Melt butter in a heavy-bottomed pan over medium heat. Add onion; cook and stir until softened, about 10 minutes.
Reduce heat to low; cover, and cook until onions are caramelized, stirring occasionally, about 20 minutes.
Stir in flour until well mixed.
Stir in chicken stock, red wine, Dijon mustard, and Worcestershire sauce; simmer until sauce is thickened, stirring frequently, about 15 minutes. Season with salt and pepper.
Nutritional Facts
Per 4 servings
Calories: 226
Carbohydrate: 11g
Fat: 18g
Fiber: 2g
Protein: 2g
Sugar: 4g
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