Pork Roast with Caramelized Parsnips

Preheat oven to 425 degrees. Coarsely grind 2 teaspoons salt, 1/2 teaspoon pepper, the fennel seeds, orange zest, and chopped rosemary in a mini chopper or a spice grinder. Rub spice mixture all over pork, and insert rosemary sprig under twine. Transfer to a large, heavy ovenproof skillet (preferably cast iron) or a roasting pan.

Roast pork for 20 minutes. Toss parsnips with oil and 1/2 teaspoon salt; arrange around pork. Roast for 20 minutes. Stir parsnips. Roast until an instant-read thermometer inserted into the center of pork reaches 140 degrees, about 15 minutes more. Transfer pork and parsnips to platter, and let pork rest for 10 minutes before untying and slicing. (If parsnips are not uniformly golden, return to oven for 5 minutes while pork rests.)