Place the lamb shanks in the slow cooker.

Season the lamb shanks evenly with sea salt and, if desired, dried rosemary for added flavor.

Cover the slow cooker with the lid and cook on low for 8 hours or until the meat is tender and falls off the bone.

Once the lamb shanks are cooked, remove them from the slow cooker.

Optionally, strain and reduce the cooking liquid in a separate saucepan to create a flavorful sauce.

Serve the lamb shanks hot with the sauce if desired.