Cook bacon crisp. Drain then chop. Set aside. Reserve drippings.
Peel pear and chop. Dice onion and celery. Sauté in a skillet with reserved bacon drippings until tender-crisp (but are not mushy) about 5 minutes.
Cube 8 slices bread. I used the ends of old bread. Place on a cookie sheet and bake on 250 15 to 20 minutes or until completely dry. Set aside.
Prepare the pork loin. Using a long, thin knife cut the loin by holding the knife at an angle and spiral cut it as you "unroll" the pork loin (think jelly roll). You will be work toward the center of the loin and will end up with a thin, rectangular slab of meat. Pound the loin with a mallet to an even thickness.
Preheat oven to 325 degrees.
In a bowl, combine the pear, onion, and celery mixture with the bread cubes. Add seasonings: salt, pepper, garlic, thyme, and brown sugar. Stir to combine. Stir in chicken broth. The mixture should be moist enough to stick together but not soggy. Evenly spread mixture over the pork loin.
Roll the loin and secure it with kitchen twine. Heat a griddle to high, add 2 T vegetable oil. When the oil is hot, sear meat on all sides. This will seal in the juices and add a golden color to the meat. Transfer the meat to a broiler pan. Add 1/2 cup water to the bottom of the broiler pan. Bake in the oven until the internal temperature registers 145 degrees. Remove from oven, lightly cover with foil, and allow to rest 10 minutes before slicing.