Chop the whole Orange including the peel into small chunks. Blitz them in a grinder and add sugar, eggs, butter/ oil. Blend them into a paste. In another bowl, shift flour and baking powder. Pour the blended mixture into the flour mix and combine well. Add the grated carrots.
Preheat the oven 180"C for 10 minutes. Line a 20 cm spring form baking tin. Pour the batter into the tin and bake them for about 40 minutes or until done. Remove and transfer it to a rack.
To make a glaze, mix 1 cup of icing sugar with a juice one orange. Check the consistency and pour over the cake. Let it rest for while. Slice and serve. The cake tastes more delicious the next day.