"Homemade pierogi with a potato-cheese filling and served with caramelized onions...."
INGREDIENTS
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For the Dough: 2 cups unbleached all-purpose flour, plus extra for the work surface ½ teaspoon salt 1 egg 1 egg yolk 1 tablespoon vegetable oil 4 to 6 tablespoons cold water For the Caramelized Onions: 4 tablespoons unsalted butter 3 large onion