Candied Sweet Potatoes with Rosemary

Preheat oven to 375 degrees. Toss potatoes with cider and syrup; season with salt.

Transfer potato mixture to a large cast-iron or other heavy ovenproof skillet, layering the wedges. Tuck rosemary sprigs among wedges. Dot with small pieces of butter. Transfer skillet to oven. Bake potatoes, tossing carefully about halfway through, until browned on edges and very tender, about 1 1/2 hours.