How to Make It
Preheat oven to 400°F. Sprinkle pork evenly with salt and pepper. Heat oil in a large ovenproof skillet or Dutch oven over medium-high.
Add pork to pan; cook over medium-high, undisturbed, until golden brown on one side, about 3 minutes. Turn pork. Repeat until each side is browned, about 12 minutes. Remove pork from skillet, and set aside.
Add mushrooms, onions, and garlic to pan; cook over medium-high, stirring often, until liquid from mushrooms has released and evaporated, about 8 minutes. Add wine; cook, scraping up browned bits from bottom of pan, until wine is reduced by half, about 5 minutes. Add stock, rosemary, and thyme; cook, undisturbed, 3 minutes. Return pork to pan. Cover, transfer to preheated oven, and roast until a thermometer inserted in thickest portion of meat registers 130°F, about 30 minutes.
Remove pan from oven. Transfer pork to a cutting board; let rest 5 minutes. Meanwhile, add orange peel strips to mushroom mixture in pan. Bring to a boil over medium-high; boil until sauce has slightly thickened, about 3 minutes. Discard orange peel strips, rosemary, and thyme.
Remove and discard twine from pork. Slice pork against the grain. Serve over polenta with mushroom mixture.
If you can’t find Corsican Muscat, you can substitute Moscato d’Asti.