Slice orange crosswise into 1/4-inch-thick rounds; discard seeds. Line a shallow 2 1/2- to 3-quart casserole with orange slices.
Pull skin and fat off chicken and discard. Rinse chicken; lay in casserole.
Mix mirin, vinegar, cornstarch, oyster sauce, tamari, and ginger. Pour evenly over chicken.
Bake, uncovered, in a 375° oven, basting occasionally with pan juices, until chicken is no longer pink at bone (cut to test), 50 to 60 minutes.
Sprinkle with green onion.
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