"For more of a bite, add two to three teaspoons of whole grain mustard along with the olive oil...."
INGREDIENTS
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1 1/2 pounds Yukon Gold potatoes (about 5 medium), unpeeled
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1/4 cup red wine vinegar
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1/2 teaspoon sugar
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1/2 small red onion, very thinly sliced
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1/4 cup extra-virgin olive oil
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2 tablespoons chopped fresh Italian parsley