1Heat oven to 450°F. Season chicken with salt and pepper on both sides. Place chicken, skin side up, on broiler pan. Bake 25 minutes.
2Meanwhile, in 1-quart saucepan, heat tamari sauce, sugar, vinegar and peel to boiling, stirring to dissolve sugar. Reduce heat to simmer. Beat in orange juice and cornstarch with whisk until well blended. Continue cooking until mixture thickens to glaze-like consistency. Remove from heat.
3After chicken has baked 25 minutes, set oven control to broil. Broil 5 minutes longer to crisp skin on chicken (leave oven door partially open to monitor broiling closely. If chicken begins to crisp sooner than 5 minutes, remove from oven.)
4Pour sauce over chicken. Sprinkle with sesame seed; garnish with green onions.