Prick both sides of each steak well with a fork, then marinate for 24 to 36 hours
in a marinade made by soy sauce, Worcestershire sauce, vinegar and sugar.
Simmer steaks on a low fire for 10 minutes in the marinade. Remove them and place
steaks in a 350 degree F oven for 10 to 20 minutes, depending on thickness of meat.
Three minutes before removing steaks, place a pineapple slice on each.
To make gravy, slowly sauté a large can of mushrooms in butter. While doing so,
boil down the sauce used for the marinade to make a gravy. Combine mushrooms and
reduced marinade sauce.
Serve individual steaks with the pineapple on top, over which has been poured
a generous amount of gravy.