Haven't had a steak until you've had a good blackened steak. Not an option for our indoor-only OP: Place a cast-iron griddle on the grill (BBQ) and close the lid on high heat for 10 minutes. You want the griddle
HOT. Go back inside and prepare the steak. Not too difficult. Cover the steak with a good coating of butter or margarine, and spread the secret blend of Cajun spices and herbs on a plate. (Easiest to obtain spice blend commercially, as in a jar of Chef Paul Prudhomme's
Blackened Steak Magic.) Dip the buttered steak in the spices, coating thoroughly. Cook steak on the hot griddle, being careful not to overcook. It cooks fast, and the coating forms a crust. You do
not want to burn the coating into a carbonized shell of coal, but you do want it to almost form a crisp crust. Do both sides, of course. And be aware, it makes a LOT of smoke.
If needing to prepare enough steaks for a group, use a larger griddle and do them at once, rather than one after the other. Later steaks on a used griddle don't do as well. Two is OK, the third is not so good.