"These meatless pierogi are a Christmas tradition but they're delicious on any cold night; they can be served either boiled or fried...."
INGREDIENTS
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1 oz. dried porcini mushrooms
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Kosher salt
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1 2-lb. bag refrigerated sauerkraut
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1 oz. (2 Tbs.) unsalted butter
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1 medium yellow onion, finely chopped (1 cup)
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Freshly ground black pepper
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2 lb. (7 cups) unbleached all-purpose flour; more as needed
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4 oz. (1/2 cup) unsalted butter, softened
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2 cups warm water