Deviled Potato Salad

Ingredients

• 3/4 cup mayonnaise
• 3 tablespoons cider vinegar
• 1 tablespoon Dijon mustard
• 1 1/2 teaspoons sugar
• 3/4 teaspoon salt
• 1/2 teaspoon black pepper
• 3 pounds cooked small (2-inch) boiling potatoes, cooled to room temperature and quartered
• 2 hard-boiled large eggs, chopped
• 3/4 cup finely chopped sweet onion
• 3/4 cup finely chopped celery
• Paprika to taste