Ingredients

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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