With a sharp knife, cut steak diagonally into thin slices, then cut slices into small pieces. Heat oil in fry pan and add steak. Sprinkle generously with garlic. Brown meat, stirring frequently. Lower heat. Add onions, peppers, celery and beef broth. Cover and cook until vegetables are crisp-tender. Blend cornstarch, water and soy sauce. Add to meat mixture and cook, stirring until thickened. Serve with hot rice.