Trim any excess fat from the tenderloin then place it in a large zip bag. Add the Japanese BBQ sauce (or other marinade) and ensure the tenderloin gets completely coasted. Press excess air out of the bag and seal it. (See notes section for other marinade ideas)
Let it marinate in the fridge for at least two hours, up to overnight.
Smoke the pork tenderloin:
Preheat your smoker to 225 °F (Note, it's fine to smoke pork tenderloin at a higher temp, it will go more quickly and possibly take on less smoke flavor)
Place the marinated pork tenderloin in the smoker and insert a meat thermometer into the thickest portion. Add some extra JBBQ sauce on top (or whatever marinade you're using).
Smoke until the internal temp reaches 145 °F then promptly remove from the smoker. This should take around 2 hours at 225 °F
Serve:
Let the tenderloin rest for at least 5 minutes before slicing. Slice against the grain, creating pieces that are about ½ inch think.
See the notes section for various ideas on what to serve this with!
Freeze:
Let the sliced meat cool down to room temperature, and portion it out based on how much you will want to reheat at once. Transfer the meat to vacuum sealer bags and seal (or store in a freezer safe zip bag with all of the air pressed out). Place in the freezer.
To reheat: defrost completely then gently heat in microwave until warmed through.
Notes
My number one use for this recipe is in my Tenderloin Tonkotsu Ramen, for which I'll make a lot of JBBQ marinated smoked pork tenderloin and freeze it for easy use in the ramen. The freezer step actually allows the smoke flavor to better distribute through the meat, which I think actually improves the flavor! Marinade & Meal IdeasMarinade: Japanese BBQ Sauce, or prepare like my Hoisin Glazed Pork TenderloinMeal Ideas:Tenderloin Tonkotsu Ramen, cube meat and use in fried rice, make JBBQ tacos or burritos, top other noodle dishesMarinade: Mexican taco marinade, copy marinade recipe from my Tri Tip Tacos Recipe.Meal Ideas: Cube meat and use in tacos & burritos Dry Rub: Brown sugar spice rub from my Smoked Chicken Breast recipe, do NOT marinate the meat in the rub, apply the rub just before placing the meat in the smoker. Meal Ideas: BBQ sandwiches, loaded mac and cheese, served with mashed potatoes,