Place the sausage, carrots and onions into a large stock pot or pan. Cook over medium heat for 13-15 minute, or until the sausage is cooked and beginning to stick to the bottom of the pan.
Add the chicken stock, oregano, salt and thyme. Bring to a boil.
Add the kale and potatoes and bring back to a boil. Reduce the heat to bring to a simmer. Cover and cook for 30 minutes, or until the kale is softened and the potatoes are cooked.
Stir in the vinegar and let warm through for five minutes. Serve warm.