In a 3-qt. slow cooker, combine the beef, salsa, brown sugar, soy sauce and garlic. Cover and cook on low 8-10 hours, until meat is tender. Using a slotted spoon, serve beef with rice and, if desired, sliced jalapeno peppers. Freeze option: Freeze individual portions of cooled stew in freezer containers. To use, partially thaw in refrigerator overnight. Heat through in a saucepan, stirring occasionally and adding water if necessary.