Preheat oven to 375 degrees F. Spray a large ovenproof skillet with nonstick cooking spray. Sprinkle the barbecue seasoning blend over the pork tenderloin. Quickly sear the meat on all sides over medium heat.
Meanwhile, while meat is searing, start the hash browns by adding the vegetable oil and butter to another large skillet. Add the shredded sweet potatoes, onion and bell pepper blend, and celery leaves in a single layer. Cook over medium heat for 3 to 4 minutes without stirring. Stir in the salt and pepper, to taste, and continue to cook until potatoes are tender, about 10 to 12 minutes.
Once the tenderloin has been seared, remove to a platter and to the same skillet whisk in the Bloody Mary mix, peach nectar, Worcestershire sauce, apple cider vinegar, brown sugar, garlic, hot sauce, cracked black pepper, and chopped peaches; simmer over medium heat for 8 to 10 minutes. Remove sauce from heat, place the seared pork in skillet and spoon sauce over top. Place the skillet in oven and cook until pork reaches an internal temperature of 155 degrees F on an instant-read thermometer. Remove meat from oven and allow to sit for a few minutes before slicing. To plate, arrange sweet potato hash browns and the sliced pork on individual dishes and top with some of the sauce. Garnish with fresh peach slices and a sprinkling of parsley.
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