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                                            Toss eggplant with 1 teaspoon salt and drain in a colander, stirring occasionally, 45 minutes. 
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                                            Rinse eggplant under cold water and dry well, pressing out any excess moisture. 
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                                            Stir together mirin, soy sauce, ginger, and seven-spice powder. 
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                                            Heat oil in a 12-inch heavy skillet over medium-high heat until it shimmers, then sauté eggplant until browned, about 8 minutes. Stir in mirin mixture and cook, gently stirring and turning frequently, until sauce becomes a glaze and eggplant is browned and tender, about 1 minute. 
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                                            Serve hot or at room temperature, sprinkled with chives.