How to Make It
In a large skillet, heat the olive oil until shimmering. Season the pork chops with salt and pepper, add them to the skillet and cook over moderately high heat until well browned, about 5 minutes per side. Transfer the pork chops to a large plate and cover loosely with foil.
Add the stock, capers and chopped rosemary to the skillet and boil until reduced to 3/4 cup, about 5 minutes. Return the pork chops to the pan and simmer until cooked through, about 3 minutes. Transfer the pork chops to 4 plates. Whisk the mustard and butter into the sauce and season with salt and pepper. Pour the mustard-caper sauce over the chops and serve.