In this recipe, adapted from my mother, Annette Gertner, an orange, pith, skin and all, provides a bittersweet counterpoint for tangy onions to season and dress a whole, broken-down chicken that’s browned on one side, then baked. Worcestershire sauce binds the flavors with a good amount of umami, while some bits of orange and onion paving the chicken skin caramelize in the oven and enrich the pan sauce. —Florence Fabricant