All-American Potato Salad - cooking recipe

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

Preparation

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.