In a small bowl, combine ketchup, Lea & Perrins, oil and salt.
Place steak in a snug-fitting bowl or doubled plastic bag.
Pour ketchup mixture over steak.
Cover or fasten and refrigerate for 24 hours.
Remove steak from marinade. Place on a rack over hot charcoal. Grill until
done as desired, about 12 minutes on each side for medium, brushing with marinade
occasionally. Or, if desired, place on a rack in a broiler pan. Place under
a preheated hot broiler for 7 to 10 minutes on each side or until done as desired,
brushing occasionally with leftover marinade.