PLACE steak in shallow glass dish or large resealable plastic bag. Top with onions and steak sauce; cover. Refrigerate at least 1 hour to marinate.
REMOVE steak from marinade; reserve marinade for later use. Place steak on cutting board; cover with plastic wrap. Pound with rolling pin or meat mallet until slightly flattened. Remove plastic wrap. Combine dressing, parsley and garlic; spread evenly onto steak. Top with peppers and potatoes. Roll up tightly, starting at one of the short ends. Tie securely with kitchen string at 2-inch intervals.
COOK bacon in large skillet on medium heat. Remove bacon from skillet, reserving drippings in skillet. Set bacon aside. Add steak to skillet; cook until browned on all sides, turning occasionally. Add broth, bay leaf and reserved marinade; bring to boil. Reduce heat to low; cover. Simmer 1 hour or until steak is cooked through and potatoes are tender, turning every 15 min. Transfer steak to cutting board; let stand 10 min. Remove string; cut steak into 1/2-inch-thick slices. Remove and discard bay leaf. Spoon broth mixture over steak slices; sprinkle with the reserved bacon.