Preheat oven to 350º F. Grease and flour a 9-inch spring form cake pan.
In a large bowl, whisk together eggs and granulated sugar until blended. Add olive oil, milk, rosemary and orange zest. Mix well. In another bowl, stir together the flour, cornmeal, baking powder, baking soda and salt. Add to the egg mixture, stirring just until blended. Do not over mix. Pour batter into prepared pan.
Bake until a toothpick inserted into the center comes out clean, 35-38 minutes. Cool completely on wire rack and place cake on a serving plate. Dust cake with confectioners’ sugar and cut into 10 slices. Garnish individual servings with fresh fruit and whipped cream or yogurt.