As soon as coffee is ground, it starts to oxidize, and that means one thing: stale, lackluster flavor. So if you're using pre-ground beans, your steak rub is missing out on that bold, aromatic ...
In a small bowl, mix the ground coffee with the chile powder, brown sugar, paprika, cumin and salt. Pat the steaks all over with the coffee-chile rub and let stand at room temperature for 30 minutes.