- 1Melt butter over medium-low heat in a large saucepan or frying pan until foaming. Sprinkle in flour while constantly whisking, and cook until raw flavor is gone, about 1 to 2 minutes.
- 2Slowly add broth, whisking constantly until mixture is smooth. Add milk and again whisk until smooth. Bring to a simmer over medium heat and cook until slightly thickened, about 10 minutes.
- 3Remove from heat, add chicken and vinegar, and stir to coat. Season well with salt and freshly ground black pepper.