1 can (10-3/4 ounces) condensed cream of mushroom soup, undiluted
1 envelope Lipton beefy onion soup mix
1/4 cup cornstarch
1/2 cup cold water
Cut roast in half. Transfer to a 5-qt. slow cooker. In a small bowl, combine the tomatoes, soup and soup mix; pour over meat. Cover and cook on low for 6-8 hours or until meat is tender.
Remove meat to a serving platter; keep warm. Skim fat from cooking juices; transfer to a large saucepan. Bring liquid to a boil. Combine cornstarch and water until smooth; stir into the pan. Bring to a boil; cook and stir for 2 minutes or until thickened. Serve with roast.