Have a large platter very, very hot—really hot!
Then the minute the steak is done, put it on the platter and work fast.
Over the steak sprinkle a very little bit of dry English mustard. Then
a squeeze or two of lemon. Now several thin slices of butter, a little
Worcestershire sauce, salt, pepper and paprika. Rub all this in with a
broad knife. Turn steak and repeat the operation. Now tip platter on
edge and quickly whip the sauce into a froth, using a fork. Serve two
or three tablespoons of sauce with each piece of steak.