Pork with Pears and Parsnip Mash

INGREDIENTS

• 1 1/2 pounds parsnips, peeled and cut into 1-inch chunks
• 1 large baking potato, peeled and cut into 1-inch chunks
• 1/2 cup whole milk, hot
• 1/2 stick unsalted butter, divided
• Coarse salt and freshly ground pepper
• 1 1/2 pounds boneless pork loin, cut into 1 1/4-inch pieces
• 2 shallots, thinly sliced crosswise (about 1/3 cup)
• 5 sprigs thyme
• 2 Bartlett pears (about 1 pound), cut into 1/2-inch pieces
• 1/3 cup cider vinegar
• 1/2 cup chicken broth or water