The vegetable traditionally used in coleslaw is cabbage. Coleslaw typically consists of finely shredded raw cabbage mixed with various dressings or sauces, often mayonnaise-based. The dish can contain a variety of additional ingredients, such as carrots, onions, and other vegetables, depending on regional variations. Cabbage is favored for its crunchy texture and ability to hold up well when mixed with dressing, making it a popular side dish for barbecues, picnics, and various meals.