Stop in for a cup of coffee

I haven't done anything all day, I'm still trying to figure out what I'll cook for dinner tonight.
A friend brought me over a beef tenderloin for helping him fix his car but I don't remember ever having any or how to cook it. :BangHead:
It's justa long round Tri Tip :lol: Favorite BBQ rub, let it sit for an hour or 2, medium fire, 165-170° inside.