"Especially in deli-style diners, potato salad is a staple accompaniment to sandwiches. It has been a regular feature on the American table since the 19th century. If you can find tiny new potatoes, by all means use them; otherwise, any red potato 2 inches (5 cm) or less in diameter will work fine...."
INGREDIENTS
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1 teaspoon salt
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2 1/2 pounds small red potatoes, unpeeled
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3 celery stalks, cut into slices 1/4 inch thick
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1/4 cup finely diced red (Spanish) onion
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For the Dressing:
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1/2 cup sour cream
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1/2 cup mayonnaise
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1 tablespoon mustard seeds
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1 green onion, including the tender green tops, finely chopped
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1/4 cup finely chopped fresh parsley
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1 teaspoon dry mustard
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1/4 teaspoon salt
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1/8 teaspoon freshly ground pepper
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1 tablespoon finely chopped fresh parsley