Toast cumin seeds in small dry skillet on medium heat 1 to 2 minutes or until aromatic. Remove from skillet. Crush seeds using mortar and pestle, spice mill, clean coffee grinder or rolling pin.
Mix brown sugar, cumin and remaining spices. Rub spice mixture evenly on both sides of steaks. Cover loosely. Refrigerate 15 minutes.
Broil or grill over medium-high heat 6 to 8 minutes per side or until desired doneness.