To ensure that this Classic Southern Style Potato Salad is gluten-free make sure to use ingredients that are certified as gluten-free including mustard, mayonnaise and seasoning. It's also an idea to check the labels, on your condiments as some relishes may contain gluten. When choosing a seasoning go for a variety that is specifically labeled as gluten-free or use your gluten-free seasoning blend. By making these ingredient choices you can savor a potato salad that's safe for everyone to enjoy.