In a bowl stir together cherries, lime juice, zest, onion, jalapeño, and coriander.
Season pork with salt and press peppercorns into it. In a large heavy skillet heat oil over moderately high heat until hot but not smoking and brown pork on all sides.
Transfer pork to a shallow baking dish and roast in oven until a meat thermometer registers 155°F., about 20 minutes. Transfer pork to a cutting board and let stand 5 to 10 minutes. Slice pork into 1/2-inch-thick medallions and serve with salsa.