Mix the marinade ingredients together in a medium bowl.
Place tenderloins in a medium bowl or ziptop bag. Pour marinade over and allow marinate to sit for at least 1 hour up to 24 hours.
Preheat grill to medium high heat, about 400ºF (204°C). Once grill is preheated, you'll turn OFF one burner. The other should remain on medium high heat.
Place the pork on the side that is ON. Cook on one of the larger sides for 3 minutes, then flip to the other larger side for another 3 minutes (pork tenderloins sort of have three sides, but one is usually much thinner).
Move the tenderloin to the indirect heat side with the fatter side towards the heat. Grill for another 4 minutes on each side (total of 8 minutes) or until an instant read meat thermometer readers 145ºF (63°C). Remove from grill and allow pork to rest before cutting into slices and serving.
Notes
Pork tenderloin is usually sold in a package with 2 pieces equaling about 1½ pounds. Oven Option:
Preheat your oven to 400ºF (204°C).
Heat a little olive oil in a large oven-safe skillet over medium-high heat on the stovetop.
Sear the marinated pork tenderloin for 2-3 minutes per side until browned.
Transfer the skillet to the preheated oven and roast for 20-25 minutes, or until an instant-read thermometer reads 145ºF (63°C).
Let the pork rest for a few minutes before slicing and serving.
Stovetop Option:
Heat 1-2 tablespoons of olive oil in a large skillet over medium-high heat.
Add the marinated pork tenderloin and sear for 3-4 minutes per side, until browned.
Once browned, reduce the heat to medium and cover the pan.
Cook the tenderloin for another 8-10 minutes, flipping once, until it reaches 145ºF (63°C) internally.