I'm all over this Dill Potato Salad from the Barefoot Contessa this summer. I think it's better served slightly warm or at room temperature, but tastes delicious when refrigerated for a few hours as well. Dill Potato Salad 3 pounds small white potatoes Kosher salt 1 cup mayonnaise 1/4 cup buttermilk 2 tablespoons Dijon mustard 2 tablespoons whole-grain mustard 1/2 cup chopped fresh dill Freshly ground black pepper 1/2 cup chopped celery 1/2 cup chopped red onion Place …