Preheat oven to 180 degrees. Grease and flour a small bundt pan or a 6 inch baking pan.
Beat egg till fluffy and pale. Add the sugar and beat till well incorporated.
Add the oil and beat.
Sift in the dry ingredients, add the orange juice and orange zest and just beat till combined. Do not overbeat.
Pour into the prepared pan and bake for 40-50 minutes till the cake is done.
Cool in pan for five minutes and then flip onto a rack to cool completely. Serve with afternoon tea.