Beat together sugar, eggs, oil, in a bowl for 2-3 minutes then, sift in the flour, soda, & nutmeg. Stir, & then fold in orange zest, kumara & raisins, until just combined.
Pour the mixture into a 20cmx20cm greased baking tin. Bake at 170° C for about 35-40 minutes, until it feels firm in the centre.
While the cake is cooking make the topping by mixing all the ingredients in a bowl until light & fluffy. Cover & chill for 1-2 hrs or until needed. To make the orange glaze whisk all the glaze ingredients together.
While the cake is hot, prick with a skewer & spoon the glaze over.
Mix all the icing ingredients together and once cooled, ice the cake with the cream cheese icing.