There is a skill in cooking a steak on a griddle, especially if you want it to turn out well and tasty.
My technique is not perfect, but I get some good results.
Firstly I heat the pan, the heat will be the guide to whether I am cooking a rare, medium or well done steak, though it must be even with a well done steak quite hot.
I take the steak, preferably at room temperature and rub seasoning and oil into the steak. This could be just olive oil, or oil and black pepper or cajun spices and sunflower oil.
I do not add oil to the griddle.
Once the pan is hot, I then griddle the steak.
This ensures I get the nice chargrill lines on my steak.
I have also used this method with lamb and chicken.