On a large plate, drizzle the pork chops with the oil, season to taste with salt and black pepper, and set aside for 30 minutes.
Meanwhile, heat a charcoal or gas grill to medium-high. To a small pot over medium heat, add the vinegar and honey, and cook until reduced to ¼ cup. Stir in the butter and rosemary, and set aside.
Grill the pork chops, turning and basting with the balsamic mixture occasionally, until browned and cooked through, 12–14 minutes. Transfer to a platter, allow to rest for 5 minutes, and serve.
