Preheat your oven to 400F and move the rack to the middle position.
Prep the tenderloins by cutting off any excess fat and the tough white skin. Pat the tenderloins dry with a kitchen towel. Place it in a baking tray or baking dish.
Apply Dry Rub and Bake
Mix all the ingredients mentioned for the dry rub. Rub the mixture all over the tenderloin ( on both sides).
Place the baking dish in the preheated oven and bake for 10-12 minutes.
Make BBQ glaze and Bake again
While the pork is in the oven, make BBQ glaze. mix bbq sauce, soy sauce, vinegar, olive oil, brown sugar, Worcestershire Sauce, garlic, salt, and cayenne (if using).
When the 15 minutes are done, remove the pork. Brush the bbq glaze generously. Bake in upper third of the oven and bake for another 10 minutes or until the pork has reached 145.
Let Pork Rest
Once done, remove the baking dish. Loosely cover the dish with aluminum foil and let it rest for 8-10 minutes.
Brush the glaze and Serve
Place the remaining BBQ sauce in a microwave-safe bowl or a saucepan. Add a tablespoon of water. Microwave it for 1 minute in a 30-second burst. Or if using a saucepan, let it some to a low simmer and then remove from heat.
Brush the above glaze on the tenderloin before serving.
Slice and serve with your favourite side.
Video
Notes
I would highly recommend using an oven thermometer, to cook the tenderloin right.