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2 pounds russet baking potatoes, peeled (about 4 medium)
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1 small onion, peeled, halved
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1/4 cup freshly chopped parsley
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1 tablespoon potato starch
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1/2 teaspoon (or more) salt
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1 large egg, lightly beaten
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Freshly ground black pepper
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Vegetable oil, for frying
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