1. Cook cumin seeds in a small skillet over medium heat 1 minute or until fragrant, stirring frequently. Place in a clean coffee grinder or blender; process until ground. Combine ground cumin, sugar, paprika, salt, and pepper; rub evenly over pork.
2. Heat a grill pan over medium-high heat. Coat pan with cooking spray. Add pork to pan; cook 5 minutes on each side or until done.