Add beef broth, chicken broth, cream, sour cream, soy sauce, Dijon mustard, Worcestershire sauce, cider vinegar, sugar and black pepper. Taste, then season with salt, if needed.
14.5 oz. low sodium beef broth, 14.5 oz. low-sodium chicken broth, 1 cup heavy cream, ¾ cup sour cream, 1 tsp Beef Instant Bouillon Granules, 1 tbsp low-sodium soy sauce, 1 tsp Dijon mustard, 1 tsp Worcestershire sauce, 1 tsp apple cider vinegar, 1 tbsp granulated sugar, ½ tsp freshly ground black pepper, kosher salt