Old Fashioned Cabbage Soup

2 chicken breasts, cut into chunks;

1 leek, sliced;

2 carrots, sliced;

2 celery stalks, sliced;

2 sweet potatoes, diced;

3 cups shredded cabbage;

1 cup rutabaga, diced;

8 cups chicken stock;

2 garlic cloves, minced;

Cooking fat;

Sea salt and freshly ground black pepper;