"Homemade pierogi with a potato-cheese filling and served with caramelized onions...."
INGREDIENTS
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2 cups unbleached all-purpose flour, plus extra for the work surface
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1/2 teaspoon salt
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1 egg
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1 egg yolk
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1 tablespoon vegetable oil
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4 to 6 tablespoons cold water
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4 tablespoons unsalted butter
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3 large onions, halved and thinly sliced
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1/4 teaspoon salt
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1 medium russet potato (about 9 ounces), peeled and sliced 3/4 inch thick
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1 tablespoon salt
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1/4 cup reserved chopped caramelized onions
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1 1/2 ounces cheddar cheese, shredded (about 1/3 cup)
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1 1/2 ounces farmers cheese, cut into small pieces (about 1/4 cup)
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1 tablespoon unsalted butter
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Salt and ground black pepper, to taste
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1 tablespoon salt
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4 tablespoons unsalted butter, for sautéing
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Sour cream, for serving