Well maybe not boil but soak in hot water at about 165 deg for a couple of hours, then seared in a scalding cast iron as you said.
Bet you’re brother was sold on ‘boiled’ steak after tasting it! Be a laugh to see him go home and try ‘boiling’ a steak after that LOL!
165? Ack! I do mine at no more than 131. 165 is for chicken and other things you have to actually kill!