There's some variations on an ancho/coffee/cocoa rub out there for beef. Try 1 Tbsp coffee beans , finely ground, 1 Tbsp Dutch unsweetened chocolate ( powdered form for baking), 2 Tbsp ground ancho chili powder , 1/2 Tbsp ground cumin, 1/2 Tbsp each black pepper and raw sugar, and a few hearty dashes of cayenne, cinnamon, and white pepper. Also, 1/2 tsp each of granulated garlic and onion and a tsp each of ground Mexican oregano and French thyme.got a recipe for that rub your using? its sounds pretty good.