Wiktionary
red slaw
n. A condiment made with green cabbage, vinegar, and ketchup.
Wikipedia
Red slaw
Red slaw (sometimes called barbecue slaw) is a condiment commonly served on hot dogs, on barbecue pork sandwiches, as a side dish for other types of barbecue, on hamburgers, or with other foods. It is an essential part of " Lexington style" North Carolina barbecue.