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Position a rack in the center of the oven and heat to 350°F. Line a rimmed baking sheet with foil, then set a large wire rack on the sheet.
Combine the garlic, sage, thyme, fennel, 2 tsp. salt, and 2 tsp. pepper in a small bowl (or right on the cutting board).
Heat the oil in a large skillet over medium-high heat. Add the pork and cook, turning occasionally, until golden brown on all sides, 10 to 12 minutes. (You may need to sear the tenderloins separately, depending on pan size.) Transfer to the rack on the baking sheet and let stand until cool enough to handle.
Meanwhile, spread half of the garlic-fennel mixture on a cutting board. Roll one of the tenderloins in the mixture (it won’t cover the pork completely), then return it to the rack on the baking sheet. Repeat with the rest of the garlic-fennel mixture and the other tenderloin. Scrape any remaining mixture from the board over the tenderloins, and press gently to adhere.
Roast until the pork registers 130°F to 135°F on an instant-read thermometer, about 15 minutes.
Transfer to the cutting board, cover loosely with foil, and let rest for 5 to 7 minutes. Slice and serve, sprinkled with the parsley, if you like. Season to taste with salt and pepper.