In a large skillet, brown beef in oil in batches; drain. Transfer to a 4- or 5-qt. slow cooker. , In a large bowl, combine the tomato sauce, onions, carrots, green pepper, pineapple, vinegar, brown sugar, corn syrup, chili powder, paprika and salt; pour over beef. , Cover and cook on low for 8-10 hours or until beef is tender. Serve with rice if desired. Freeze option: Freeze cooled stew in freezer containers. To use, partially thaw in refrigerator overnight. Heat through in a saucepan, stirring occasionally; add broth or water if necessary.