Mix the flour, salt, baking powder, and baking soda in a small bowl. Set aside.
In the bowl of an electric mixer, mix sugar, eggs, and zest with the whisk attachment. Mix on high speed for about 5 minutes. The mixture should be thick and fluffy.
Keep the mixer running and add olive oil a little at a time. Reduce the speed and add milk and juice. Then add the dry ingredients and mix until just combined.
Grease the bottom and sides of a springform pan and then pour the batter into the pan.
Bake at 375 for 40-45 minutes, or until a skewer inserted into the middle of the cake comes out clean. If the top starts to brown too fast, lower the temperature to 325 and cover it with tin foil. Let the cake cool for about 10 minutes in the pan. Then, move the cake to a wire rack.
Let the cake cool completely. Then, top with whipped cream and sliced citrus.