In blender or food processor, combine bourbon, soy sauce, brown sugar, garlic, mustard, ginger, Worcestershire sauce, hot sauce, and oil; pulse until smooth.
Place tenderloin and marinade in a food storage bag; refrigerate for 4 hours or overnight.
Cook 4 inches from a hot charcoal fire for 15 to 25 minutes or until the pork has reached 140-145 degrees, basting often while cooking (the temp will continue to rise a bit when resting).
Let rest a few minutes when done, then slice in 1/2-inch thick slices to serve.
Notes
Double up on the marinade. That way, you can set aside a clean portion to brush on the pork as it cooks to give it a glossy, saucy finish. Never reuse the marinade that raw meat has touched for this.
Use a fork to lightly pierce the pork before marinating. The punctures serve as tiny channels that help the marinade penetrate deeper into the meat, so every bite is juicy, tender, and packed with flavor.
Don’t overcook your pork. Pork tenderloin is pretty unforgiving if overcooked. The safe internal temperature is 145°F (per the USDA), but I usually pull mine from the heat at about 140°F, as the meat will rise to the perfect temperature as it rests.
Give the pork time to rest before slicing. 5-10 minutes is plenty of time for the juices to redistribute, preventing them from running out all over your cutting board as you slice it.