"Thursday was "Polish Night" at the restaurant run by Grant Achatz's parents, with specials like sausage and sauerkraut, cabbage soup and pierogies. Those humble pierogies inspired the avant-garde ones he created as a chef, filled with a mustard sauce for the beef served on the same plate. The pierogies here, filled with mustardy mashed potatoes, pay homage to both versions...."
INGREDIENTS
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2 1/2 cups all-purpose flour
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1 cup sour cream
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1 large egg, beaten
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1 large egg yolk, beaten
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4 tablespoons unsalted butter, melted
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1/2 teaspoon salt
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3/4 pound medium Yukon Gold potatoes
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3 tablespoons sour cream
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1 1/2 tablespoons Dijon mustard
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4 tablespoons unsalted butter, softened
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Salt and freshly ground pepper
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Vegetable oil, for coating
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1 tablespoon chopped parsley