Prepare a grill for high heat. Whisk together the oil, rosemary and a pinch each of salt and pepper.
Slice the apple horizontally into 1/4-inch-thick slices; brush the slices with the oil mixture and grill, covered, until grill marks appear about 1 minute per side.
Brush the chops with the oil mixture and grill, covered, for 1 minute; rotate the chops a half-turn without flipping, and grill, covered, for 1 minute more. Flip the chops and grill, covered, 1 minute; rotate and grill, covered, 1 minute more. Transfer the chops to a plate, cover with foil and let rest for 5 minutes before serving with the apple slices as garnish.
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