There's a place near us called Chophouse '47 that cooks the best filet I've ever been served. (And I've eaten at Bern's in Tampa and more than a few other fine places). One night after a particularly good dinner and a generous tip the waiter got chatty on the way out and said all their filets were cooked in a skillet with butter only. I don't have the stones to try it with a filet but I want to.