Melt butter in a 2-qt. saucepan over medium heat. Whisk in flour, and cook, whisking constantly, 1 minute. Gradually whisk in chicken broth. Increase heat to high, and bring to a boil, whisking constantly. Reduce heat to medium; simmer, stirring occasionally, 5 minutes or until thickened. Remove from heat, and stir in shredded chicken, fresh herbs, and lemon juice. Add kosher salt and freshly ground black pepper to taste. Serve immediately.
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