What Southern relish, often made from chopped pickled vegetables, is commonly called chow-chow?

Chow-chow is a pickled vegetable relish in Southern American cooking.

Recipes vary widely, but chopped cabbage, green tomatoes, onions, peppers, and other vegetables are commonly preserved in a seasoned vinegar mixture. The relish may be served with beans, greens, fried foods, meat, or sandwiches, making it a familiar accompaniment in many Southern kitchens.

Chow-chow is not one single standardized recipe. Regional versions can be sweet, hot, chunky, or finely chopped. It is also different from Chinese or Canadian uses of the name, which refer to other foods. In the American South, its defining feature is preserved mixed vegetables rather than a single main ingredient.