Red slaw is a regional version of coleslaw, originating from North Carolina. Also known as barbecue slaw, it's traditionally made with a combination of shredded green cabbage, water, vinegar, sugar, and ketchup, which gives the salad a reddish hue.
Red slaw is especially popular in Lexington, where it's served as a part of Lexington-style barbecue. The salad is also often used in hot dogs and sandwiches made with barbecued meat. Depending on the area, red slaw might contain other ingredients such as mustard seeds, black pepper, onions, carrots, or hot peppers, but what's important is that red slaw is always served well-chilled.