1 1/2teaspoonssaltplus more to season onions and apples, as needed
1/4teaspoonground black pepperplus more to season onions and apples, as needed
3tablespoonsvegetable oildivided
1tablespoonDijon mustard
1tablespoonfresh thyme divided
2onionshalved and sliced
3applescored and sliced
3/4cupapple cideror apple juice
3/4cupchicken stock
1tablespoonbutter
Instructions
Preheat the oven to 450℉. Season pork on all sides with salt and pepper.
Heat 2 tablespoons of the oil in a large nonstick ovenproof skillet over medium-high heat. Add pork and sear until all sides are brown, turning occasionally, about 5 minutes. Transfer pork to plate to cool slightly, about 3 minutes. Once cooled, spread Dijon mustard over the top and sides of pork. Sprinkle with half of the thyme.
Add remaining 1 tablespoon oil to the skillet. Add onion slices and apples. Sauté over medium heat until golden, about 5 minutes. Spread evenly over the skillet and sprinkle with salt and pepper. Place the seared pork atop the onions and apples.
Transfer the skillet to oven and roast until onions and apples are soft and brown and a meat thermometer inserted into center of the pork registers 150°F, about 15 minutes.
Transfer pork to a platter and tent with foil. Let it rest for 10 minutes.
While the pork rests, pour apple cider and chicken stock over the onions and apples in the skillet, scraping any brown bits from the bottom of the pan. Sprinkle with additional thyme. Bring to a simmer and cook until reduced by half, about 5 minutes. Add butter and stir until melted.
Cut pork on a diagonal into 1/2-inch-thick slices. Spoon onions and apples onto plates. Top with pork and serve.