Came across this method a few days ago on another site. You set up two zones, hot & cool, on grill. At about 225 degrees, cool side, cook the steak(s) until they reach a temp of about 110. Baste both sides with butter and finish off on the hot side (450 or higher) until temp is about 130-135. I did a London Broil 4# and ....WOW!