"(Russian Potato-and-Cabbage Turnovers)..."
INGREDIENTS
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2 2/3 cups all-purpose flour
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1/2 teaspoon double-acting baking powder
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1/2 teaspoon salt
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1 1/2 sticks (3/4 cup) cold unsalted butter, cut into bits
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2 large egg yolks
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1/2 cup sour cream
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1 tablespoon cold water if necessary
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3/4 pound russet (baking) potatoes
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2 tablespoons unsalted butter
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1 onion, chopped fine
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3/4 teaspoon caraway seeds
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1 tablespoon vegetable oil
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3 cups chopped cabbage
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3 tablespoons sour cream
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2 tablespoons water if necessary
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3 tablespoons finely chopped fresh dill
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an egg wash made by beating 1 large egg with 1 teaspoon water