In a small bowl, combine the olive oil, minced garlic, thyme, rosemary, salt, and black pepper to make the marinade.
Place the pork tenderloin steaks in a shallow dish and pour the marinade over them, ensuring they are coated evenly. Cover the dish and refrigerate for at least 2 hours, or ideally, overnight.
Preheat the grill or grill pan to medium-high heat. Remove the steaks from the marinade, allowing any excess to drip off.
Grill the pork tenderloin steaks for about 4-5 minutes per side, or until they reach an internal temperature of 145°F (63°C) for medium doneness.
Remove the steaks from the grill and let them rest for a few minutes before slicing.