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Bring potatoes in salted water to a boil.
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Reduce heat; simmer till tender (about 20 to 25 minutes).
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Two minutes before potatoes are done, add peas.
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Drain off water; cool to room temperature.
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Cut potatoes in wedges.
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In large bowl, combine mayonnaise, mustard, vinegar, tarragon and salt.
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Stir in potatoes, peas and chopped onion until coated.
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Chill for 1 hour or until ready to serve.