Beat the oil, yoghurt, sugar, salt, eggs and lemon zest in a bowl until the mixture becomes lighter in colour. Combine the flour and baking powder, stir into the egg mixture. Transfer the cake mixture to the prepared, greased tin.
Approx. 40 mins. in the centre of an oven preheated to 180°C. Remove from the oven, allow to cool slightly, remove from the tin and leave to cool on a rack. Dust with icing sugar.