Brown roast in oil in a Dutch oven on all sides; drain. Combine the sherry, soy sauce, sugar, bouillon and cinnamon stick; pour over roast., Cover and bake at 325° for 2-3/4 to 3-1/4 hours or until meat and vegetables are tender, adding the carrots, potatoes and onion during the last 30 minutes of cooking., Remove roast and vegetables to a serving platter; keep warm. Combine cornstarch and water until smooth. Stir into pan. Bring to a boil; cook and stir for 2 minutes or until thickened. Serve with roast and vegetables.