Also known as celery cabbage, this vegetable has soft green and white leaves with a mild, sweet flavour and crisp texture. It is widely available in supermarkets and is easily recognized by its fat, cylindrical shape and tightly packed leaves. When buying, choose specimens that are heavy and firm. Before use, discard any damaged outer leaves and trim the root. Do not worry if the leaves have small black spots on them; they are harmless. This type of cabbage keeps well and can be stored in the salad compartment of the refrigerator for several weeks. It is used in stir-fries, salads and soups.