Cook bacon in a large skillet over medium heat. Once finished, place it on paper towels to drain, then crumble.
Prepare the barbecue sauce in the same large skillet by adding the onion and thyme to the bacon grease, and cook, stirring often, for 2-3 minutes or until the onion is soft.
Add garlic and red pepper and cook, stirring frequently, for 30-45 seconds.
Add the remaining ingredients, including the bacon crumbles, and mix thoroughly.
Simmer, stirring occasionally, for about 20 minutes, to allow the flavors time to mingle.
Preheat the oven to 300 degrees.
In a small Dutch oven, combine the chicken broth, pork tenderloin, and half the barbecue sauce.
Bake the pork tenderloin in the oven for 3-4 hours or until it shreds easily.
Finish the pork by adding the remaining barbecue sauce and mixing thoroughly. Taste and re-season with salt and pepper if needed.
Cook the French's Fried Onions in the oven for just a few minutes–watch carefully as they will burn easily.
Toast the buns if preferred.
Create the pulled pork sandwich by piling the shredded pork on the bottom bun and topping it with crunchy onions.