Season pork shoulder with salt and pepper. Brown on stove top, make sure to brown all sides, about 15 minutes. Transfer browned roast to slow cooker. Pour salsa verde over pork and sprinkle chopped jalapeños on top. Cook on low for 8 hours.
Remove pork to cutting board. With two forks, shred meat into chunks, discard any big pieces of fat. Transfer juices to a large measuring cup or a de-fatter and remove as much fat as possible. Add shredded meat to a pot, pour verde sauce over meat and heat on stovetop until warmed through. Sprinkle with freshly chopped cilantro and serve with tortillas, toppings and refried beans.
