Place chicken in a single layer in a 9- by 13-inch pan.
Bake in a 400 oven until meat is no longer pink in center of thickest part (cut to test), 25 to 30 minutes. After 15 minutes, spread hoisin mixture onto chicken. Baste once with juices.
Transfer meat and juices to a platter.
Meanwhile, mix mint, cilantro, onions, and lemon peel.
