"Though pierogies are a classic Polish dish, food editor Paul Grimes had them every Easter at his Russian grandmother's house. Pierogies are satisfyingly rich, so you'll only need to serve 2 or 3 per person as a first course; leftovers make a great breakfast...."
INGREDIENTS
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3 cups all-purpose flour plus additional for kneading
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1 cup water
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1 large egg
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2 teaspoons vegetable oil
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1 teaspoon salt
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1 1/2 pound russet (baking) potatoes
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6 ounces coarsely grated extra-sharp white Cheddar (2 1/4 cups)
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1/4 teaspoon salt
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1/4 teaspoon black pepper
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1/8 teaspoon ground nutmeg
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1 medium onion, halved lengthwise and thinly sliced crosswise
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1 stick (1/2 cup) unsalted butter
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Accompaniment: sour cream