Put the potatoes in a large pot and cover with cold water. Add 2 teaspoons salt, partially cover and bring to a boil over high heat. Reduce the heat and simmer until the potatoes are tender, about 10 minutes. Drain, then return the potatoes to the pot and coarsely mash with a large spoon. Cover and keep warm.
Meanwhile, make the chimichurri sauce: Pulse the parsley, cilantro, olive oil, shallot, garlic, vinegar and 1/4 teaspoon each salt and pepper in a food processor to form a coarse paste.
Heat a large grill pan over medium-high heat. Pat the pork chops dry and season with salt and pepper. Lightly brush the grill pan with olive oil, then grill the chops until just cooked through, about 2 minutes per side. Serve the pork chops and potatoes with the chimichurri sauce.
Courtesy of Food Network Magazine, Photograph by Antonis Achilleos