- Combine soy sauce, lime juice, oil, brown sugar, cumin seed, pepper, chili powder, and garlic in a bowl. Add pork tenderloin and turn to coat. Marinate in refrigerator for 3 hours.
- Light grill to medium-high heat. Grill pork for 5 to 7 minutes or until desired doneness, flipping slices halfway through.
- Serve slices whole, or dice and serve on tortillas.