Preheat the oven to 350f and set the rack to the middle level. Line an oiled 9-inch by 2 inch deep round cake pan with parchment paper.
In a medium-sized bowl, combine the flour, sugar, salt, baking powder, and baking soda and stir until combined. Set aside.
In a large bowl combine the eggs, milk, olive oil, orange juice, Gran Gala, vanilla extract, and orange zest and whisk until combined.
Add the dry ingredients to the wet ingredients and stir until just combined. The batter should be on the thinner side and easy to pour.
Pour the batter into the prepared cake pan and give the cake pan a tap to allow any air to rise to the top.
Place the cake pan in the oven and cook for 55 minutes or until a toothpick inserted in the center comes out clean.
Allow the cake to cool before adding the glaze, or serving. If you're not using the glaze, serve plain, or top with powdered sugar. Enjoy!