1. Season the pork chops with salt and pepper.
2. In a large nonstick skillet, heat the oil over medium-high. Add the pork chops and cook until they are just barely pink at the center, 6 to 8 minutes on each side, depending on the thickness. Transfer the chops to a plate and cover with foil.
3. Reduce the heat to medium-low. Add the onions and brown sugar to the skillet and cook, stirring constantly, until the onions are golden-brown, about 5 minutes. Reduce the heat if the onions begin to burn.
4. Add the pears and rosemary and cook until the pears are just tender, about 2 minutes. Add the apple juice and vinegar, then simmer until the mixture is reduced and slightly thickened, about 2 to 3 minutes.
5. Stir in the mustard. Return the pork chops to the pan and turn to coat with the sauce. Serve the chops with the pear and onion sauce spooned over the top.
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