Sweet Potato Salad with Lemony Buttermilk Dressing

In 6-quart saucepot, place potatoes and enough water to cover; heat to boiling over high heat. Reduce heat to medium-low; cover and simmer 8 minutes or until potatoes are just tender.

Meanwhile, from lemon, grate 1 teaspoon peel and squeeze 1 tablespoon juice. In large bowl, whisk lemon peel and juice with buttermilk, mayonnaise, 1/2 teaspoon salt, and 1/4 teaspoon coarsely ground black pepper. Stir in celery, onion, and parsley.

Drain potatoes; cool 10 minutes. Add to dressing in bowl and gently stir until potatoes are well coated. Makes about 8 cups. Spoon potato salad into large container with tight-fitting lid. Can be refrigerated up to 1 day.