Preheat your oven to 350°.
Heat the bacon fat in a cast-iron skillet over medium-high heat.
Season the tenderloins with steak seasoning, salt, and pepper.
Place the tenderloins in the hot fat (it will spit back at you, so be careful). Brown the pork on all sides, about 5 minutes.
Use a potholder to place the skillet into the oven. Roast the pork for 15 minutes.
Carefully (remember that potholder) remove the skillet from the oven.
Pour 1 cup (or more) barbecue sauce over the pork.
Return the skillet to the oven until it reaches an internal temperature of 145°, about 5 to 10 minutes more.
Remove from the oven.
Cover the meat with aluminum foil and rest for 10 minutes.
Transfer to your work surface and cut into thin slices.
Pile sliced pork onto each bun. Top with extra sauce, coleslaw, and pickles. Yee haw!