I actually made this with flank steak for Amy's birthday party. It worked out pretty well for a large group instead of individual steaks. I might tinker with the rub if I ever make it again, but it was tasty nonetheless. I think I'd add onion powder and maybe ground coriander and use espresso powder instead of the instant coffee.
Beef Sirloin With Coffee And Chili Rub
1/4 cup light brown sugar
1 1/2 Tbsp instant coffee
1 tsp dry mustard
1 tsp ground coriander
1 tsp smoked paprika
1 tsp garlic powder
1/2 tsp ancho chili powder (or other chili powder if you can't find the ancho)
2 (1 1/2 lb) boneless beef sirloins, cut 1 1/2" thick
1- Combine the first six ingredients in a bowl.
2- Rub both sides of the steaks and then let them sit for 30 minutes.
3- Grill steaks (or broil if you do not have a grill) on medium high until cooked to desired temperature.