Preheat oven to 340°F (170°C). Lightly grease a loaf cake pan.
Blend the corn flour with the sugar until the mixture is very fine. Remove the mixture and place in a large bowl. Add the almond flour, cornstarch, salt, and baking powder, and mix.
Place in the blender the orange juice, zest, eggs, milk, and oil. Blend well and pour into the flour mixture. Mix until well incorporated.
Place the mixture into the prepared pan.
Bake for 45/ 50 minutes or until a toothpick inserted into the center comes out clean. Keep in mind that all ovens are different.
Let cool before removing.
For the icing
In a small bowl place powdered sugar with two tablespoons of orange juice. Mix and add one more tablespoon of orange juice little by little, and integrate it until you get the desired consistency. If necessary add more orange juice. The frosting should not be too runny.
When the cake is completely cold, spread the icing on the top. End up with orange zest.
Notes
Store the cake in an air-tight container at room temperature for up to 3 days or in the refrigerator for up to 5 days.