Preheat the oven to 180°C/Fan 160°C/Gas 4.
Season the chops. Heat half the olive oil in a flameproof casserole dish and fry the chops until nicely browned all over. Set aside on a plate.
Fry the onion in the empty dish for a few minutes until translucent. Add the sage leaves, return the chops to the dish and pour over the apple juice. Adjust the seasoning, cover and simmer for 18 minutes, until the pork is cooked through.
Meanwhile, heat the remaining oil in a frying pan. When hot, quick-fry the apple slices on both sides, until golden. Arrange the apples on a serving platter and keep warm.
Lift the chops out of the casserole and sit them on the apples. Quickly reduce the liquid left in the casserole to a sauce, then add the crème fraîche. Taste and season if necessary. Pour the sauce over the pork and serve with Parmesan crushed new potatoes.