Herbed Potato Salad

Cover potatoes with cold water in a medium saucepan and add salt. Bring to a boil and cook over medium heat until tender, 7 to 9 minutes. Drain in a colander and transfer to a large bowl. Toss with vinegar and season generously with pepper. Set the potatoes aside to cool.

Whisk together yogurt, mayonnaise and mustard in a small bowl. Add the dressing to the reserved potatoes along with celery, scallions, parsley and dill, if using, stirring gently to combine. Season with salt and pepper.