This lightly sweetened, fruity cake is made with extra-virgin olive oil instead of butter. Olive oil is a healthy substitute for butter. Although it is a source of fat, it contains healthy monounsaturated fats and is a good source of antioxidants. Baking with olive oil produces a lighter textured cake, provides moisture and helps enhance the flavor of the other ingredients. The juice and zest of the oranges help balance the intensity of the olive oil flavor. Serve this delicious cake with a dollop of fresh whipped cream and orange slices!