INGREDIENTS
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2 pounds waxy potatoes, such as red-skinned potatoes
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1 teaspoon salt, plus more as needed
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1/2 cup mayonnaise
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1 tablespoon Dijon mustard
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2 stalks celery, diced (about 3/4 cup)
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1 large shallot or 1/4 small onion, minced (about 1/4 cup)
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1/4 cup chopped scallions, fresh parsley, tarragon, or dill, plus more for garnish
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3 large eggs, hard-boiled and diced (optional)
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Freshly ground black pepper