For that crusty exterior, your steak needs to hit the heat entirely without any gaps in the cooking surface. A heavy-duty cast iron pan is the better option for this. Furthermore, a Porterhouse is ...

My [local grocery store] had a sale on Certified Angus Beef porterhouse ... steak is frozen.) When the steak is done cooking sous vide, preheat the pan over medium-high heat. (I preheated my cast ...