Well without a meat themometer (best way to do steaks is with one but you can do it by feel, almost as good).
Salt the steak the morning before cooking and leave on the counter top all day - you want it to
A. Come up to room temp
B. Draw out moisture and then reabsorb it (known as dry brining)
Next you heat up a griddle pan or heavy frying pan as hot as possible - 10 minutes on full whack should be enough. Give the steaks a a minute and a half to two minutes on each side for that thickness. Don't flip more than once - you want to develop the nice caramelized lines on the outside.
Then baste with melted butter, melted butter for days, coat them in in for 30 seconds spooning it over and transfer to a baking tray.
Put them in the oven for about 5 minutes or so at 60 degrees. What you're looking for is just a bit of give in the steak when pressed, like it shouldn't spring back straight away. Or if you have a meat thermometer and internal temp of 51 degrees (it will rise to 56 over the next few minutes while it is resting).
Bring the steaks out of the oven and allow them to rest for a minute before plating.