Walnut And Sage Pesto Turkey Breast

2 tablespoon butter 1 cup chopped onion 3 shallots (about 2/3 cup) 1 teaspoon snipped fresh thyme (or 1/4 tsp. dried thyme crushed) 2 tablespoon all-purpose flour 1 14 ounce can reduced-sodium chicken broth 1 tablespoon reduced-sodium soy sauce 1 tablespoon Worcestershire sauce ⅛ teaspoon salt ¼ teaspoon pepper