Preheat oven to 160 degrees Fan forced.
In a food processor, chop the orange, peel included to a chunky juice, mix the baking soda with the water and pour it into the juiced orange. Using the processor, incl each ingredient at a time, mixing well after each add on.
Using a cupcake baking tray, incl the paper cups into each cupcake hole and spoon mixture into each cup to about 3/4 full.
Bake in the preheated oven for about 25 - 30 minutes or until a skewer comes out clean. Let the cupcakes cool completely, sprinkle with icing sugar and top with orange zest for decoration. Enjoy!