Preheat oven to 350 deg .Line up the cake pan with parchment paper and spray it with oil.
In a bowl ,combine all-purpose flour, baking powder and salt , whisk and keep it aside.
Add sugar to a bowl. Add the zest of orange and lemon along with rosemary to the sugar.
Slowly rub the contents with your fingers , until the sugar gets moist and fragrant.
In a stand mixer, add three eggs and the sugar with the zest and beat on medium speed for about 5 minutes or until it turns pale yellow.
Next add milk as it is beating and then add in the oil and mix well.
Lastly , add all purpose flour that was set aside .Mix using a spatula until it is just about incorporated. Do not over mix.
Pour the batter into the cake pan and bake it at 350 deg F for 35 minutes. A wooden skewer should come out clean , when inserted in the cake.
Cool on the cooling rack and cut into big slices. Dust with confectioners sugar if you like. Enjoy.
Notes
Using oil instead of butter makes it a light cake. The original recipe uses olive oil. I substituted it with vegetable oil and did not find any significant difference.
This can be had as a tea or coffee cake, or just by itself. It can also be served with strawberry compote and a drizzle of olive oil to taste even better.
Use Eggs at room temperature so it is easier to beat and incorporate.
You can get creative and dust it with molds on the cake to get various shapes and make it look pretty.