A classic recipe for Beef Stroganoff served over buttered egg noodles. The dish features tender cubes of sirloin steak and cremini mushrooms in a rich, savory pan sauce. The sauce is created by browning the steak, sautéing carrots and onions, and then deglazing the pan with brandy. The sauce is enriched with beef stock, thickened with a cornstarch slurry, and finished with sour cream and Dijon mustard for a creamy, tangy flavor.