Preheat oven to 325°. Combine Lipton® Recipe Secrets® Onion Soup Mix, water, chili sauce and sugar in Dutch oven or 5-quart heavy oven-proof saucepot; add roast.
Bake covered 3 hours or until roast is tender. Remove roast; reserve juices. Bring reserved juices to a boil over high heat. Boil 4 minutes.
Meanwhile, shred roast with fork. Stir roast into reserved juices and simmer, stirring frequently, 1 minute. Serve on rolls.