In a slow cooker layer butter, onions, lentils, carrots, celery, garlic, can of diced tomatoes and shredded cabbage. Gently mix together. Lay kielbasa pieces on top. Top with Worcestershire sauce, hot sauce, paprika, garlic powder, onion powder, salt, celery seed, pepper, nutmeg and apple cider vinegar. Sprinkle top with dark brown sugar. Add potatoes, pour chicken stock or broth over all. Cover and cook on low for 8 to 10 hours or until lentils are tender.