Picked up a 3 pound piece of Morton's tri tip steak at Costco yesterday. What's the best way to prepare it if I don't have an outdoor grill? I can do cast iron pan and finish in the oven (how long for 3 pounds?) or should I cut it up into steaks? I have to look again with my glasses on, I think it says something about tenderized and enzymes on the packaging, not sure if it is marinated or not. Any tips?