Trabuco Oaks is a restaurant located up in the hills above Los Angeles in the town of Trabuco Canyon. Although it's a little hard to find, it is definitely worth the effort as they cook some of the best steaks that you'll ever eat.
If you should happen to drop in while wearing a necktie then you may want to take it off before actually entering the building as they have a tradition of sorts involving neckties which you may not want to participate in (sorry, no hints allowed).
One of their more famous customers in years gone by was Richard M. Nixon whose summer home was in nearby San Clemente.