Ingredients

  • 3 lbs potatoes, peeled and cut into 1-inch chunks (9 medium)
  • 1/4 cup cider vinegar
  • 2 tablespoons olive oil
  • 1 tablespoon spicy brown mustard
  • 1/2 teaspoon ground black pepper
  • 1 1/2 teaspoons salt
  • 3/4 cup mayonnaise
  • 1/2 cup whole milk
  • 2 medium celery ribs, chopped
  • 1/2 small red onion, chopped

Method

  • In 4-quart saucepan, place potatoes and enough water to cover; heat to boiling over high heat.
  • Reduce heat to low; cover and simmer 8 to 10 minutes or until potatoes are fork-tender.
  • Meanwhile, in large bowl, with wire whisk, mix vinegar, oil, mustard, pepper, and 1 teaspoon salt.
  • Drain potatoes. Add hot potatoes to bowl with vinaigrette; gently stir with rubber spatula to combine. Let stand until cool. In small bowl, with wire whisk, mix mayonnaise, milk, and remaining 1/2 teaspoon salt until smooth.
  • Add mayonnaise mixture, celery, and red onion to potatoes. Gently stir with rubber spatula to combine.
  • Cover and refrigerate 4 hours or overnight.