Preheat the oven to 180 C and line a cake tin with parchment paper.
Grate the carrots, chop the walnuts and mix the two together in a bowl. keep a small handful of walnuts back to use for garnish.
Add the wet ingredients and mix well with the carrots and walnuts.
Mix together all the dry ingredients in a separate bowl then mix this into the wet ingredients thoroighly.
Pour the batter into a cake tin, then bake in the oven for 40-50 minutes. You can cover the top with foil if it gets brown too quickly.
Allow the cake to cool. Then make the glaze by adding orange juice to the icing sugar. Stirring well to remove any lumps. Keep the icing thick enough to just pour out but not too thin that it runs right off the cake. Then garnish with the chopped reserved walnuts.
