Season pork chops with salt and pepper. Heat a large Dutch oven over medium heat. Add the vegetable oil. Once the oil is hot, add the pork chops and brown well on both sides. This step will take about 15 minutes. Turn the pork at least once during the cooking time.
While the pork chops are browning, combine husked tomatillos and pepper in a saucepan covered with water. Bring to simmer over medium heat and cook until tomatillos are soft, about 10 minutes. Remove from heat.
Place chopped onion, garlic, cooked tomatillo, and Serrano peppers in a blender or food processor and puree until smooth. Add a little of the tomatillo-cooking water to the blender if needed.
Once your pork chops are well browned, add the tomatillo sauce. Add the chopped purslane, cumin and salt. If you wish, you can mix in other veggies like I did here, by adding diced zucchini. It’s a great combination. Keep simmering on low heat for about 20 more minutes, until the pork chop meat is tender.