A rich vegan cake that will satisfy even the most extreme chocolate craving, balanced with the delicate bitterness of candied orange peel. I wanted my slices to be sweet, chewy, slightly bitter and beautifully caramelized. I built on a Food & Wine recipe for candied orange slices (http://www.foodandwine.com/recipes/candied-orange-slices), but to achieve the perfect browning on top. This recipe makes more frosting than is needed for a 9-inch cake, but it keeps well in the freezer.