1. Preheat the oven to 180°C (fan-assisted). Grease and flour a rectangular loaf pan measuring 11x32 cm. In a large bowl, add the olive oil, orange juice, carob syrup, water, and vanilla extract, then mix.
2. Add the sugar, orange zest, flour, baking powder, and baking soda. Mix well and pour the mixture into the cake pan.
3. Bake in the preheated oven for 45 minutes. To check if it's ready, insert a wooden skewer into the center of the cake; if it comes out clean, remove it from the oven. Let it cool completely, then unmold and sprinkle with icing sugar.
